update pip

-<#
-.Synopsis
-Activate a Python virtual environment for the current PowerShell session.
-
-.Description
-Pushes the python executable for a virtual environment to the front of the
-$Env:PATH environment variable and sets the prompt to signify that you are
-in a Python virtual environment. Makes use of the command line switches as
-well as the `pyvenv.cfg` file values present in the virtual environment.
-
-.Parameter VenvDir
-Path to the directory that contains the virtual environment to activate. The
-default value for this is the parent of the directory that the Activate.ps1
-script is located within.
-
-.Parameter Prompt
-The prompt prefix to display when this virtual environment is activated. By
-default, this prompt is the name of the virtual environment folder (VenvDir)
-surrounded by parentheses and followed by a single space (ie. '(.venv) ').
-
-.Example
-Activate.ps1
-Activates the Python virtual environment that contains the Activate.ps1 script.
-
-.Example
-Activate.ps1 -Verbose
-Activates the Python virtual environment that contains the Activate.ps1 script,
-and shows extra information about the activation as it executes.
-
-.Example
-Activate.ps1 -VenvDir C:\Users\MyUser\Common\.venv
-Activates the Python virtual environment located in the specified location.
-
-.Example
-Activate.ps1 -Prompt "MyPython"
-Activates the Python virtual environment that contains the Activate.ps1 script,
-and prefixes the current prompt with the specified string (surrounded in
-parentheses) while the virtual environment is active.
-
-.Notes
-On Windows, it may be required to enable this Activate.ps1 script by setting the
-execution policy for the user. You can do this by issuing the following PowerShell
-command:
-
-PS C:\> Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
-
-For more information on Execution Policies: 
-https://go.microsoft.com/fwlink/?LinkID=135170
-
-#>
-Param(
-    [Parameter(Mandatory = $false)]
-    [String]
-    $VenvDir,
-    [Parameter(Mandatory = $false)]
-    [String]
-    $Prompt
-)
-
-<# Function declarations --------------------------------------------------- #>
-
-<#
-.Synopsis
-Remove all shell session elements added by the Activate script, including the
-addition of the virtual environment's Python executable from the beginning of
-the PATH variable.
-
-.Parameter NonDestructive
-If present, do not remove this function from the global namespace for the
-session.
-
-#>
-function global:deactivate ([switch]$NonDestructive) {
-    # Revert to original values
-
-    # The prior prompt:
-    if (Test-Path -Path Function:_OLD_VIRTUAL_PROMPT) {
-        Copy-Item -Path Function:_OLD_VIRTUAL_PROMPT -Destination Function:prompt
-        Remove-Item -Path Function:_OLD_VIRTUAL_PROMPT
-    }
-
-    # The prior PYTHONHOME:
-    if (Test-Path -Path Env:_OLD_VIRTUAL_PYTHONHOME) {
-        Copy-Item -Path Env:_OLD_VIRTUAL_PYTHONHOME -Destination Env:PYTHONHOME
-        Remove-Item -Path Env:_OLD_VIRTUAL_PYTHONHOME
-    }
-
-    # The prior PATH:
-    if (Test-Path -Path Env:_OLD_VIRTUAL_PATH) {
-        Copy-Item -Path Env:_OLD_VIRTUAL_PATH -Destination Env:PATH
-        Remove-Item -Path Env:_OLD_VIRTUAL_PATH
-    }
-
-    # Just remove the VIRTUAL_ENV altogether:
-    if (Test-Path -Path Env:VIRTUAL_ENV) {
-        Remove-Item -Path env:VIRTUAL_ENV
-    }
-
-    # Just remove the _PYTHON_VENV_PROMPT_PREFIX altogether:
-    if (Get-Variable -Name "_PYTHON_VENV_PROMPT_PREFIX" -ErrorAction SilentlyContinue) {
-        Remove-Variable -Name _PYTHON_VENV_PROMPT_PREFIX -Scope Global -Force
-    }
-
-    # Leave deactivate function in the global namespace if requested:
-    if (-not $NonDestructive) {
-        Remove-Item -Path function:deactivate
-    }
-}
-
-<#
-.Description
-Get-PyVenvConfig parses the values from the pyvenv.cfg file located in the
-given folder, and returns them in a map.
-
-For each line in the pyvenv.cfg file, if that line can be parsed into exactly
-two strings separated by `=` (with any amount of whitespace surrounding the =)
-then it is considered a `key = value` line. The left hand string is the key,
-the right hand is the value.
-
-If the value starts with a `'` or a `"` then the first and last character is
-stripped from the value before being captured.
-
-.Parameter ConfigDir
-Path to the directory that contains the `pyvenv.cfg` file.
-#>
-function Get-PyVenvConfig(
-    [String]
-    $ConfigDir
-) {
-    Write-Verbose "Given ConfigDir=$ConfigDir, obtain values in pyvenv.cfg"
-
-    # Ensure the file exists, and issue a warning if it doesn't (but still allow the function to continue).
-    $pyvenvConfigPath = Join-Path -Resolve -Path $ConfigDir -ChildPath 'pyvenv.cfg' -ErrorAction Continue
-
-    # An empty map will be returned if no config file is found.
-    $pyvenvConfig = @{ }
-
-    if ($pyvenvConfigPath) {
-
-        Write-Verbose "File exists, parse `key = value` lines"
-        $pyvenvConfigContent = Get-Content -Path $pyvenvConfigPath
-
-        $pyvenvConfigContent | ForEach-Object {
-            $keyval = $PSItem -split "\s*=\s*", 2
-            if ($keyval[0] -and $keyval[1]) {
-                $val = $keyval[1]
-
-                # Remove extraneous quotations around a string value.
-                if ("'""".Contains($val.Substring(0, 1))) {
-                    $val = $val.Substring(1, $val.Length - 2)
-                }
-
-                $pyvenvConfig[$keyval[0]] = $val
-                Write-Verbose "Adding Key: '$($keyval[0])'='$val'"
-            }
-        }
-    }
-    return $pyvenvConfig
-}
-
-
-<# Begin Activate script --------------------------------------------------- #>
-
-# Determine the containing directory of this script
-$VenvExecPath = Split-Path -Parent $MyInvocation.MyCommand.Definition
-$VenvExecDir = Get-Item -Path $VenvExecPath
-
-Write-Verbose "Activation script is located in path: '$VenvExecPath'"
-Write-Verbose "VenvExecDir Fullname: '$($VenvExecDir.FullName)"
-Write-Verbose "VenvExecDir Name: '$($VenvExecDir.Name)"
-
-# Set values required in priority: CmdLine, ConfigFile, Default
-# First, get the location of the virtual environment, it might not be
-# VenvExecDir if specified on the command line.
-if ($VenvDir) {
-    Write-Verbose "VenvDir given as parameter, using '$VenvDir' to determine values"
-}
-else {
-    Write-Verbose "VenvDir not given as a parameter, using parent directory name as VenvDir."
-    $VenvDir = $VenvExecDir.Parent.FullName.TrimEnd("\\/")
-    Write-Verbose "VenvDir=$VenvDir"
-}
-
-# Next, read the `pyvenv.cfg` file to determine any required value such
-# as `prompt`.
-$pyvenvCfg = Get-PyVenvConfig -ConfigDir $VenvDir
-
-# Next, set the prompt from the command line, or the config file, or
-# just use the name of the virtual environment folder.
-if ($Prompt) {
-    Write-Verbose "Prompt specified as argument, using '$Prompt'"
-}
-else {
-    Write-Verbose "Prompt not specified as argument to script, checking pyvenv.cfg value"
-    if ($pyvenvCfg -and $pyvenvCfg['prompt']) {
-        Write-Verbose "  Setting based on value in pyvenv.cfg='$($pyvenvCfg['prompt'])'"
-        $Prompt = $pyvenvCfg['prompt'];
-    }
-    else {
-        Write-Verbose "  Setting prompt based on parent's directory's name. (Is the directory name passed to venv module when creating the virutal environment)"
-        Write-Verbose "  Got leaf-name of $VenvDir='$(Split-Path -Path $venvDir -Leaf)'"
-        $Prompt = Split-Path -Path $venvDir -Leaf
-    }
-}
-
-Write-Verbose "Prompt = '$Prompt'"
-Write-Verbose "VenvDir='$VenvDir'"
-
-# Deactivate any currently active virtual environment, but leave the
-# deactivate function in place.
-deactivate -nondestructive
-
-# Now set the environment variable VIRTUAL_ENV, used by many tools to determine
-# that there is an activated venv.
-$env:VIRTUAL_ENV = $VenvDir
-
-if (-not $Env:VIRTUAL_ENV_DISABLE_PROMPT) {
-
-    Write-Verbose "Setting prompt to '$Prompt'"
-
-    # Set the prompt to include the env name
-    # Make sure _OLD_VIRTUAL_PROMPT is global
-    function global:_OLD_VIRTUAL_PROMPT { "" }
-    Copy-Item -Path function:prompt -Destination function:_OLD_VIRTUAL_PROMPT
-    New-Variable -Name _PYTHON_VENV_PROMPT_PREFIX -Description "Python virtual environment prompt prefix" -Scope Global -Option ReadOnly -Visibility Public -Value $Prompt
-
-    function global:prompt {
-        Write-Host -NoNewline -ForegroundColor Green "($_PYTHON_VENV_PROMPT_PREFIX) "
-        _OLD_VIRTUAL_PROMPT
-    }
-}
-
-# Clear PYTHONHOME
-if (Test-Path -Path Env:PYTHONHOME) {
-    Copy-Item -Path Env:PYTHONHOME -Destination Env:_OLD_VIRTUAL_PYTHONHOME
-    Remove-Item -Path Env:PYTHONHOME
-}
-
-# Add the venv to the PATH
-Copy-Item -Path Env:PATH -Destination Env:_OLD_VIRTUAL_PATH
-$Env:PATH = "$VenvExecDir$([System.IO.Path]::PathSeparator)$Env:PATH"

-# This file must be used with "source bin/activate" *from bash*
-# you cannot run it directly
-
-deactivate () {
-    # reset old environment variables
-    if [ -n "${_OLD_VIRTUAL_PATH:-}" ] ; then
-        PATH="${_OLD_VIRTUAL_PATH:-}"
-        export PATH
-        unset _OLD_VIRTUAL_PATH
-    fi
-    if [ -n "${_OLD_VIRTUAL_PYTHONHOME:-}" ] ; then
-        PYTHONHOME="${_OLD_VIRTUAL_PYTHONHOME:-}"
-        export PYTHONHOME
-        unset _OLD_VIRTUAL_PYTHONHOME
-    fi
-
-    # This should detect bash and zsh, which have a hash command that must
-    # be called to get it to forget past commands.  Without forgetting
-    # past commands the $PATH changes we made may not be respected
-    if [ -n "${BASH:-}" -o -n "${ZSH_VERSION:-}" ] ; then
-        hash -r
-    fi
-
-    if [ -n "${_OLD_VIRTUAL_PS1:-}" ] ; then
-        PS1="${_OLD_VIRTUAL_PS1:-}"
-        export PS1
-        unset _OLD_VIRTUAL_PS1
-    fi
-
-    unset VIRTUAL_ENV
-    if [ ! "${1:-}" = "nondestructive" ] ; then
-    # Self destruct!
-        unset -f deactivate
-    fi
-}
-
-# unset irrelevant variables
-deactivate nondestructive
-
-VIRTUAL_ENV="/home/ubuntu/dbocl_pip"
-export VIRTUAL_ENV
-
-_OLD_VIRTUAL_PATH="$PATH"
-PATH="$VIRTUAL_ENV/bin:$PATH"
-export PATH
-
-# unset PYTHONHOME if set
-# this will fail if PYTHONHOME is set to the empty string (which is bad anyway)
-# could use `if (set -u; : $PYTHONHOME) ;` in bash
-if [ -n "${PYTHONHOME:-}" ] ; then
-    _OLD_VIRTUAL_PYTHONHOME="${PYTHONHOME:-}"
-    unset PYTHONHOME
-fi
-
-if [ -z "${VIRTUAL_ENV_DISABLE_PROMPT:-}" ] ; then
-    _OLD_VIRTUAL_PS1="${PS1:-}"
-    if [ "x(dbocl_pip) " != x ] ; then
-	PS1="(dbocl_pip) ${PS1:-}"
-    else
-    if [ "`basename \"$VIRTUAL_ENV\"`" = "__" ] ; then
-        # special case for Aspen magic directories
-        # see https://aspen.io/
-        PS1="[`basename \`dirname \"$VIRTUAL_ENV\"\``] $PS1"
-    else
-        PS1="(`basename \"$VIRTUAL_ENV\"`)$PS1"
-    fi
-    fi
-    export PS1
-fi
-
-# This should detect bash and zsh, which have a hash command that must
-# be called to get it to forget past commands.  Without forgetting
-# past commands the $PATH changes we made may not be respected
-if [ -n "${BASH:-}" -o -n "${ZSH_VERSION:-}" ] ; then
-    hash -r
-fi

-# This file must be used with "source bin/activate.csh" *from csh*.
-# You cannot run it directly.
-# Created by Davide Di Blasi <davidedb@gmail.com>.
-# Ported to Python 3.3 venv by Andrew Svetlov <andrew.svetlov@gmail.com>
-
-alias deactivate 'test $?_OLD_VIRTUAL_PATH != 0 && setenv PATH "$_OLD_VIRTUAL_PATH" && unset _OLD_VIRTUAL_PATH; rehash; test $?_OLD_VIRTUAL_PROMPT != 0 && set prompt="$_OLD_VIRTUAL_PROMPT" && unset _OLD_VIRTUAL_PROMPT; unsetenv VIRTUAL_ENV; test "\!:*" != "nondestructive" && unalias deactivate'
-
-# Unset irrelevant variables.
-deactivate nondestructive
-
-setenv VIRTUAL_ENV "/home/ubuntu/dbocl_pip"
-
-set _OLD_VIRTUAL_PATH="$PATH"
-setenv PATH "$VIRTUAL_ENV/bin:$PATH"
-
-
-set _OLD_VIRTUAL_PROMPT="$prompt"
-
-if (! "$?VIRTUAL_ENV_DISABLE_PROMPT") then
-    if ("dbocl_pip" != "") then
-        set env_name = "dbocl_pip"
-    else
-        if (`basename "VIRTUAL_ENV"` == "__") then
-            # special case for Aspen magic directories
-            # see https://aspen.io/
-            set env_name = `basename \`dirname "$VIRTUAL_ENV"\``
-        else
-            set env_name = `basename "$VIRTUAL_ENV"`
-        endif
-    endif
-    set prompt = "[$env_name] $prompt"
-    unset env_name
-endif
-
-alias pydoc python -m pydoc
-
-rehash

-# This file must be used with ". bin/activate.fish" *from fish* (http://fishshell.org)
-# you cannot run it directly
-
-function deactivate  -d "Exit virtualenv and return to normal shell environment"
-    # reset old environment variables
-    if test -n "$_OLD_VIRTUAL_PATH"
-        set -gx PATH $_OLD_VIRTUAL_PATH
-        set -e _OLD_VIRTUAL_PATH
-    end
-    if test -n "$_OLD_VIRTUAL_PYTHONHOME"
-        set -gx PYTHONHOME $_OLD_VIRTUAL_PYTHONHOME
-        set -e _OLD_VIRTUAL_PYTHONHOME
-    end
-
-    if test -n "$_OLD_FISH_PROMPT_OVERRIDE"
-        functions -e fish_prompt
-        set -e _OLD_FISH_PROMPT_OVERRIDE
-        functions -c _old_fish_prompt fish_prompt
-        functions -e _old_fish_prompt
-    end
-
-    set -e VIRTUAL_ENV
-    if test "$argv[1]" != "nondestructive"
-        # Self destruct!
-        functions -e deactivate
-    end
-end
-
-# unset irrelevant variables
-deactivate nondestructive
-
-set -gx VIRTUAL_ENV "/home/ubuntu/dbocl_pip"
-
-set -gx _OLD_VIRTUAL_PATH $PATH
-set -gx PATH "$VIRTUAL_ENV/bin" $PATH
-
-# unset PYTHONHOME if set
-if set -q PYTHONHOME
-    set -gx _OLD_VIRTUAL_PYTHONHOME $PYTHONHOME
-    set -e PYTHONHOME
-end
-
-if test -z "$VIRTUAL_ENV_DISABLE_PROMPT"
-    # fish uses a function instead of an env var to generate the prompt.
-
-    # save the current fish_prompt function as the function _old_fish_prompt
-    functions -c fish_prompt _old_fish_prompt
-
-    # with the original prompt function renamed, we can override with our own.
-    function fish_prompt
-        # Save the return status of the last command
-        set -l old_status $status
-
-        # Prompt override?
-        if test -n "(dbocl_pip) "
-            printf "%s%s" "(dbocl_pip) " (set_color normal)
-        else
-            # ...Otherwise, prepend env
-            set -l _checkbase (basename "$VIRTUAL_ENV")
-            if test $_checkbase = "__"
-                # special case for Aspen magic directories
-                # see https://aspen.io/
-                printf "%s[%s]%s " (set_color -b blue white) (basename (dirname "$VIRTUAL_ENV")) (set_color normal)
-            else
-                printf "%s(%s)%s" (set_color -b blue white) (basename "$VIRTUAL_ENV") (set_color normal)
-            end
-        end
-
-        # Restore the return status of the previous command.
-        echo "exit $old_status" | .
-        _old_fish_prompt
-    end
-
-    set -gx _OLD_FISH_PROMPT_OVERRIDE "$VIRTUAL_ENV"
-end

-#!/home/ubuntu/dbocl_pip/bin/python3.8
-# -*- coding: utf-8 -*-
-import re
-import sys
-from setuptools.command.easy_install import main
-if __name__ == '__main__':
-    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
-    sys.exit(main())

-#!/home/ubuntu/dbocl_pip/bin/python3.8
-# -*- coding: utf-8 -*-
-import re
-import sys
-from setuptools.command.easy_install import main
-if __name__ == '__main__':
-    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
-    sys.exit(main())

-#!/home/ubuntu/dbocl_pip/bin/python3.8
-# -*- coding: utf-8 -*-
-import re
-import sys
-from pip._internal.cli.main import main
-if __name__ == '__main__':
-    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
-    sys.exit(main())

-#!/home/ubuntu/dbocl_pip/bin/python3.8
-# -*- coding: utf-8 -*-
-import re
-import sys
-from pip._internal.cli.main import main
-if __name__ == '__main__':
-    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
-    sys.exit(main())

-#!/home/ubuntu/dbocl_pip/bin/python3.8
-# -*- coding: utf-8 -*-
-import re
-import sys
-from pip._internal.cli.main import main
-if __name__ == '__main__':
-    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
-    sys.exit(main())

-python3.8

-python3.8

-/usr/bin/python3.8

+MIT License
+
 Copyright 2021 Vincent Nambatac
 Copyright 2021 Vincent Nambatac
 
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

-from dbocl_pkg import cdep

 [build-system]
 [build-system]
 requires = [
 requires = [
-    "setuptools>=54"
-    "wheel"
-    "boto3>=1.6.6"
-    "interruptingcow"
+    "setuptools>=54",
+    "wheel",
+    "boto3>=1.6.6",
+    "interruptingcow",
     "pytz"
     "pytz"
-]
-
-build-backend = "setuptools.build_metadata"
+]

-"""Run the EasyInstall command"""
-
-if __name__ == '__main__':
-    from setuptools.command.easy_install import main
-    main()

-pip

-Copyright (c) 2008-2019 The pip developers (see AUTHORS.txt file)
-
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be
-included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

-Metadata-Version: 2.1
-Name: pip
-Version: 20.0.2
-Summary: The PyPA recommended tool for installing Python packages.
-Home-page: https://pip.pypa.io/
-Author: The pip developers
-Author-email: pypa-dev@groups.google.com
-License: MIT
-Project-URL: Documentation, https://pip.pypa.io
-Project-URL: Source, https://github.com/pypa/pip
-Keywords: distutils easy_install egg setuptools wheel virtualenv
-Platform: UNKNOWN
-Classifier: Development Status :: 5 - Production/Stable
-Classifier: Intended Audience :: Developers
-Classifier: License :: OSI Approved :: MIT License
-Classifier: Topic :: Software Development :: Build Tools
-Classifier: Programming Language :: Python
-Classifier: Programming Language :: Python :: 2
-Classifier: Programming Language :: Python :: 2.7
-Classifier: Programming Language :: Python :: 3
-Classifier: Programming Language :: Python :: 3.5
-Classifier: Programming Language :: Python :: 3.6
-Classifier: Programming Language :: Python :: 3.7
-Classifier: Programming Language :: Python :: 3.8
-Classifier: Programming Language :: Python :: Implementation :: CPython
-Classifier: Programming Language :: Python :: Implementation :: PyPy
-Requires-Python: >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*
-
-pip - The Python Package Installer
-==================================
-
-.. image:: https://img.shields.io/pypi/v/pip.svg
-   :target: https://pypi.org/project/pip/
-
-.. image:: https://readthedocs.org/projects/pip/badge/?version=latest
-   :target: https://pip.pypa.io/en/latest
-
-pip is the `package installer`_ for Python. You can use pip to install packages from the `Python Package Index`_ and other indexes.
-
-Please take a look at our documentation for how to install and use pip:
-
-* `Installation`_
-* `Usage`_
-
-Updates are released regularly, with a new version every 3 months. More details can be found in our documentation:
-
-* `Release notes`_
-* `Release process`_
-
-If you find bugs, need help, or want to talk to the developers please use our mailing lists or chat rooms:
-
-* `Issue tracking`_
-* `Discourse channel`_
-* `User IRC`_
-
-If you want to get involved head over to GitHub to get the source code, look at our development documentation and feel free to jump on the developer mailing lists and chat rooms:
-
-* `GitHub page`_
-* `Dev documentation`_
-* `Dev mailing list`_
-* `Dev IRC`_
-
-Code of Conduct
----------------
-
-Everyone interacting in the pip project's codebases, issue trackers, chat
-rooms, and mailing lists is expected to follow the `PyPA Code of Conduct`_.
-
-.. _package installer: https://packaging.python.org/guides/tool-recommendations/
-.. _Python Package Index: https://pypi.org
-.. _Installation: https://pip.pypa.io/en/stable/installing.html
-.. _Usage: https://pip.pypa.io/en/stable/
-.. _Release notes: https://pip.pypa.io/en/stable/news.html
-.. _Release process: https://pip.pypa.io/en/latest/development/release-process/
-.. _GitHub page: https://github.com/pypa/pip
-.. _Dev documentation: https://pip.pypa.io/en/latest/development
-.. _Issue tracking: https://github.com/pypa/pip/issues
-.. _Discourse channel: https://discuss.python.org/c/packaging
-.. _Dev mailing list: https://groups.google.com/forum/#!forum/pypa-dev
-.. _User IRC: https://webchat.freenode.net/?channels=%23pypa
-.. _Dev IRC: https://webchat.freenode.net/?channels=%23pypa-dev
-.. _PyPA Code of Conduct: https://www.pypa.io/en/latest/code-of-conduct/
-
-

-../../../bin/pip,sha256=gpPWkLN6MR4Uh1-v9bSu9ZjnCcIy7Vgo8eo4Q2La7GM,241
-../../../bin/pip3,sha256=gpPWkLN6MR4Uh1-v9bSu9ZjnCcIy7Vgo8eo4Q2La7GM,241
-../../../bin/pip3.8,sha256=gpPWkLN6MR4Uh1-v9bSu9ZjnCcIy7Vgo8eo4Q2La7GM,241
-pip-20.0.2.dist-info/INSTALLER,sha256=zuuue4knoyJ-UwPPXg8fezS7VCrXJQrAP7zeNuwvFQg,4
-pip-20.0.2.dist-info/LICENSE.txt,sha256=W6Ifuwlk-TatfRU2LR7W1JMcyMj5_y1NkRkOEJvnRDE,1090
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-Wheel-Version: 1.0
-Generator: bdist_wheel (0.34.2)
-Root-Is-Purelib: true
-Tag: py2-none-any
-Tag: py3-none-any
-

-[console_scripts]
-pip = pip._internal.cli.main:main
-pip3 = pip._internal.cli.main:main
-pip3.8 = pip._internal.cli.main:main
-

-pip

-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from typing import List, Optional
-
-
-__version__ = "20.0.2"
-
-
-def main(args=None):
-    # type: (Optional[List[str]]) -> int
-    """This is an internal API only meant for use by pip's own console scripts.
-
-    For additional details, see https://github.com/pypa/pip/issues/7498.
-    """
-    from pip._internal.utils.entrypoints import _wrapper
-
-    return _wrapper(args)

-from __future__ import absolute_import
-
-import os
-import sys
-
-# If we are running from a wheel, add the wheel to sys.path
-# This allows the usage python pip-*.whl/pip install pip-*.whl
-if __package__ == '':
-    # __file__ is pip-*.whl/pip/__main__.py
-    # first dirname call strips of '/__main__.py', second strips off '/pip'
-    # Resulting path is the name of the wheel itself
-    # Add that to sys.path so we can import pip
-    path = os.path.dirname(os.path.dirname(__file__))
-    sys.path.insert(0, path)
-
-from pip._internal.cli.main import main as _main  # isort:skip # noqa
-
-if __name__ == '__main__':
-    sys.exit(_main())

-#!/usr/bin/env python
-import pip._internal.utils.inject_securetransport  # noqa
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from typing import Optional, List
-
-
-def main(args=None):
-    # type: (Optional[List[str]]) -> int
-    """This is preserved for old console scripts that may still be referencing
-    it.
-
-    For additional details, see https://github.com/pypa/pip/issues/7498.
-    """
-    from pip._internal.utils.entrypoints import _wrapper
-
-    return _wrapper(args)

-"""Build Environment used for isolation during sdist building
-"""
-
-# The following comment should be removed at some point in the future.
-# mypy: strict-optional=False
-# mypy: disallow-untyped-defs=False
-
-import logging
-import os
-import sys
-import textwrap
-from collections import OrderedDict
-from distutils.sysconfig import get_python_lib
-from sysconfig import get_paths
-
-from pip._vendor.pkg_resources import Requirement, VersionConflict, WorkingSet
-
-from pip import __file__ as pip_location
-from pip._internal.utils.subprocess import call_subprocess
-from pip._internal.utils.temp_dir import TempDirectory
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-from pip._internal.utils.ui import open_spinner
-
-if MYPY_CHECK_RUNNING:
-    from typing import Tuple, Set, Iterable, Optional, List
-    from pip._internal.index.package_finder import PackageFinder
-
-logger = logging.getLogger(__name__)
-
-
-class _Prefix:
-
-    def __init__(self, path):
-        # type: (str) -> None
-        self.path = path
-        self.setup = False
-        self.bin_dir = get_paths(
-            'nt' if os.name == 'nt' else 'posix_prefix',
-            vars={'base': path, 'platbase': path}
-        )['scripts']
-        # Note: prefer distutils' sysconfig to get the
-        # library paths so PyPy is correctly supported.
-        purelib = get_python_lib(plat_specific=False, prefix=path)
-        platlib = get_python_lib(plat_specific=True, prefix=path)
-        if purelib == platlib:
-            self.lib_dirs = [purelib]
-        else:
-            self.lib_dirs = [purelib, platlib]
-
-
-class BuildEnvironment(object):
-    """Creates and manages an isolated environment to install build deps
-    """
-
-    def __init__(self):
-        # type: () -> None
-        self._temp_dir = TempDirectory(kind="build-env")
-
-        self._prefixes = OrderedDict((
-            (name, _Prefix(os.path.join(self._temp_dir.path, name)))
-            for name in ('normal', 'overlay')
-        ))
-
-        self._bin_dirs = []  # type: List[str]
-        self._lib_dirs = []  # type: List[str]
-        for prefix in reversed(list(self._prefixes.values())):
-            self._bin_dirs.append(prefix.bin_dir)
-            self._lib_dirs.extend(prefix.lib_dirs)
-
-        # Customize site to:
-        # - ensure .pth files are honored
-        # - prevent access to system site packages
-        system_sites = {
-            os.path.normcase(site) for site in (
-                get_python_lib(plat_specific=False),
-                get_python_lib(plat_specific=True),
-            )
-        }
-        self._site_dir = os.path.join(self._temp_dir.path, 'site')
-        if not os.path.exists(self._site_dir):
-            os.mkdir(self._site_dir)
-        with open(os.path.join(self._site_dir, 'sitecustomize.py'), 'w') as fp:
-            fp.write(textwrap.dedent(
-                '''
-                import os, site, sys
-
-                # First, drop system-sites related paths.
-                original_sys_path = sys.path[:]
-                known_paths = set()
-                for path in {system_sites!r}:
-                    site.addsitedir(path, known_paths=known_paths)
-                system_paths = set(
-                    os.path.normcase(path)
-                    for path in sys.path[len(original_sys_path):]
-                )
-                original_sys_path = [
-                    path for path in original_sys_path
-                    if os.path.normcase(path) not in system_paths
-                ]
-                sys.path = original_sys_path
-
-                # Second, add lib directories.
-                # ensuring .pth file are processed.
-                for path in {lib_dirs!r}:
-                    assert not path in sys.path
-                    site.addsitedir(path)
-                '''
-            ).format(system_sites=system_sites, lib_dirs=self._lib_dirs))
-
-    def __enter__(self):
-        self._save_env = {
-            name: os.environ.get(name, None)
-            for name in ('PATH', 'PYTHONNOUSERSITE', 'PYTHONPATH')
-        }
-
-        path = self._bin_dirs[:]
-        old_path = self._save_env['PATH']
-        if old_path:
-            path.extend(old_path.split(os.pathsep))
-
-        pythonpath = [self._site_dir]
-
-        os.environ.update({
-            'PATH': os.pathsep.join(path),
-            'PYTHONNOUSERSITE': '1',
-            'PYTHONPATH': os.pathsep.join(pythonpath),
-        })
-
-    def __exit__(self, exc_type, exc_val, exc_tb):
-        for varname, old_value in self._save_env.items():
-            if old_value is None:
-                os.environ.pop(varname, None)
-            else:
-                os.environ[varname] = old_value
-
-    def cleanup(self):
-        # type: () -> None
-        self._temp_dir.cleanup()
-
-    def check_requirements(self, reqs):
-        # type: (Iterable[str]) -> Tuple[Set[Tuple[str, str]], Set[str]]
-        """Return 2 sets:
-            - conflicting requirements: set of (installed, wanted) reqs tuples
-            - missing requirements: set of reqs
-        """
-        missing = set()
-        conflicting = set()
-        if reqs:
-            ws = WorkingSet(self._lib_dirs)
-            for req in reqs:
-                try:
-                    if ws.find(Requirement.parse(req)) is None:
-                        missing.add(req)
-                except VersionConflict as e:
-                    conflicting.add((str(e.args[0].as_requirement()),
-                                     str(e.args[1])))
-        return conflicting, missing
-
-    def install_requirements(
-        self,
-        finder,  # type: PackageFinder
-        requirements,  # type: Iterable[str]
-        prefix_as_string,  # type: str
-        message  # type: Optional[str]
-    ):
-        # type: (...) -> None
-        prefix = self._prefixes[prefix_as_string]
-        assert not prefix.setup
-        prefix.setup = True
-        if not requirements:
-            return
-        args = [
-            sys.executable, os.path.dirname(pip_location), 'install',
-            '--ignore-installed', '--no-user', '--prefix', prefix.path,
-            '--no-warn-script-location',
-        ]  # type: List[str]
-        if logger.getEffectiveLevel() <= logging.DEBUG:
-            args.append('-v')
-        for format_control in ('no_binary', 'only_binary'):
-            formats = getattr(finder.format_control, format_control)
-            args.extend(('--' + format_control.replace('_', '-'),
-                         ','.join(sorted(formats or {':none:'}))))
-
-        index_urls = finder.index_urls
-        if index_urls:
-            args.extend(['-i', index_urls[0]])
-            for extra_index in index_urls[1:]:
-                args.extend(['--extra-index-url', extra_index])
-        else:
-            args.append('--no-index')
-        for link in finder.find_links:
-            args.extend(['--find-links', link])
-
-        for host in finder.trusted_hosts:
-            args.extend(['--trusted-host', host])
-        if finder.allow_all_prereleases:
-            args.append('--pre')
-        args.append('--')
-        args.extend(requirements)
-        with open_spinner(message) as spinner:
-            call_subprocess(args, spinner=spinner)
-
-
-class NoOpBuildEnvironment(BuildEnvironment):
-    """A no-op drop-in replacement for BuildEnvironment
-    """
-
-    def __init__(self):
-        pass
-
-    def __enter__(self):
-        pass
-
-    def __exit__(self, exc_type, exc_val, exc_tb):
-        pass
-
-    def cleanup(self):
-        pass
-
-    def install_requirements(self, finder, requirements, prefix, message):
-        raise NotImplementedError()

-"""Cache Management
-"""
-
-# The following comment should be removed at some point in the future.
-# mypy: strict-optional=False
-
-import hashlib
-import json
-import logging
-import os
-
-from pip._vendor.packaging.tags import interpreter_name, interpreter_version
-from pip._vendor.packaging.utils import canonicalize_name
-
-from pip._internal.exceptions import InvalidWheelFilename
-from pip._internal.models.link import Link
-from pip._internal.models.wheel import Wheel
-from pip._internal.utils.temp_dir import TempDirectory
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-from pip._internal.utils.urls import path_to_url
-
-if MYPY_CHECK_RUNNING:
-    from typing import Optional, Set, List, Any, Dict
-
-    from pip._vendor.packaging.tags import Tag
-
-    from pip._internal.models.format_control import FormatControl
-
-logger = logging.getLogger(__name__)
-
-
-def _hash_dict(d):
-    # type: (Dict[str, str]) -> str
-    """Return a stable sha224 of a dictionary."""
-    s = json.dumps(d, sort_keys=True, separators=(",", ":"), ensure_ascii=True)
-    return hashlib.sha224(s.encode("ascii")).hexdigest()
-
-
-class Cache(object):
-    """An abstract class - provides cache directories for data from links
-
-
-        :param cache_dir: The root of the cache.
-        :param format_control: An object of FormatControl class to limit
-            binaries being read from the cache.
-        :param allowed_formats: which formats of files the cache should store.
-            ('binary' and 'source' are the only allowed values)
-    """
-
-    def __init__(self, cache_dir, format_control, allowed_formats):
-        # type: (str, FormatControl, Set[str]) -> None
-        super(Cache, self).__init__()
-        assert not cache_dir or os.path.isabs(cache_dir)
-        self.cache_dir = cache_dir or None
-        self.format_control = format_control
-        self.allowed_formats = allowed_formats
-
-        _valid_formats = {"source", "binary"}
-        assert self.allowed_formats.union(_valid_formats) == _valid_formats
-
-    def _get_cache_path_parts_legacy(self, link):
-        # type: (Link) -> List[str]
-        """Get parts of part that must be os.path.joined with cache_dir
-
-        Legacy cache key (pip < 20) for compatibility with older caches.
-        """
-
-        # We want to generate an url to use as our cache key, we don't want to
-        # just re-use the URL because it might have other items in the fragment
-        # and we don't care about those.
-        key_parts = [link.url_without_fragment]
-        if link.hash_name is not None and link.hash is not None:
-            key_parts.append("=".join([link.hash_name, link.hash]))
-        key_url = "#".join(key_parts)
-
-        # Encode our key url with sha224, we'll use this because it has similar
-        # security properties to sha256, but with a shorter total output (and
-        # thus less secure). However the differences don't make a lot of
-        # difference for our use case here.
-        hashed = hashlib.sha224(key_url.encode()).hexdigest()
-
-        # We want to nest the directories some to prevent having a ton of top
-        # level directories where we might run out of sub directories on some
-        # FS.
-        parts = [hashed[:2], hashed[2:4], hashed[4:6], hashed[6:]]
-
-        return parts
-
-    def _get_cache_path_parts(self, link):
-        # type: (Link) -> List[str]
-        """Get parts of part that must be os.path.joined with cache_dir
-        """
-
-        # We want to generate an url to use as our cache key, we don't want to
-        # just re-use the URL because it might have other items in the fragment
-        # and we don't care about those.
-        key_parts = {"url": link.url_without_fragment}
-        if link.hash_name is not None and link.hash is not None:
-            key_parts[link.hash_name] = link.hash
-        if link.subdirectory_fragment:
-            key_parts["subdirectory"] = link.subdirectory_fragment
-
-        # Include interpreter name, major and minor version in cache key
-        # to cope with ill-behaved sdists that build a different wheel
-        # depending on the python version their setup.py is being run on,
-        # and don't encode the difference in compatibility tags.
-        # https://github.com/pypa/pip/issues/7296
-        key_parts["interpreter_name"] = interpreter_name()
-        key_parts["interpreter_version"] = interpreter_version()
-
-        # Encode our key url with sha224, we'll use this because it has similar
-        # security properties to sha256, but with a shorter total output (and
-        # thus less secure). However the differences don't make a lot of
-        # difference for our use case here.
-        hashed = _hash_dict(key_parts)
-
-        # We want to nest the directories some to prevent having a ton of top
-        # level directories where we might run out of sub directories on some
-        # FS.
-        parts = [hashed[:2], hashed[2:4], hashed[4:6], hashed[6:]]
-
-        return parts
-
-    def _get_candidates(self, link, canonical_package_name):
-        # type: (Link, Optional[str]) -> List[Any]
-        can_not_cache = (
-            not self.cache_dir or
-            not canonical_package_name or
-            not link
-        )
-        if can_not_cache:
-            return []
-
-        formats = self.format_control.get_allowed_formats(
-            canonical_package_name
-        )
-        if not self.allowed_formats.intersection(formats):
-            return []
-
-        candidates = []
-        path = self.get_path_for_link(link)
-        if os.path.isdir(path):
-            for candidate in os.listdir(path):
-                candidates.append((candidate, path))
-        # TODO remove legacy path lookup in pip>=21
-        legacy_path = self.get_path_for_link_legacy(link)
-        if os.path.isdir(legacy_path):
-            for candidate in os.listdir(legacy_path):
-                candidates.append((candidate, legacy_path))
-        return candidates
-
-    def get_path_for_link_legacy(self, link):
-        # type: (Link) -> str
-        raise NotImplementedError()
-
-    def get_path_for_link(self, link):
-        # type: (Link) -> str
-        """Return a directory to store cached items in for link.
-        """
-        raise NotImplementedError()
-
-    def get(
-        self,
-        link,            # type: Link
-        package_name,    # type: Optional[str]
-        supported_tags,  # type: List[Tag]
-    ):
-        # type: (...) -> Link
-        """Returns a link to a cached item if it exists, otherwise returns the
-        passed link.
-        """
-        raise NotImplementedError()
-
-    def cleanup(self):
-        # type: () -> None
-        pass
-
-
-class SimpleWheelCache(Cache):
-    """A cache of wheels for future installs.
-    """
-
-    def __init__(self, cache_dir, format_control):
-        # type: (str, FormatControl) -> None
-        super(SimpleWheelCache, self).__init__(
-            cache_dir, format_control, {"binary"}
-        )
-
-    def get_path_for_link_legacy(self, link):
-        # type: (Link) -> str
-        parts = self._get_cache_path_parts_legacy(link)
-        return os.path.join(self.cache_dir, "wheels", *parts)
-
-    def get_path_for_link(self, link):
-        # type: (Link) -> str
-        """Return a directory to store cached wheels for link
-
-        Because there are M wheels for any one sdist, we provide a directory
-        to cache them in, and then consult that directory when looking up
-        cache hits.
-
-        We only insert things into the cache if they have plausible version
-        numbers, so that we don't contaminate the cache with things that were
-        not unique. E.g. ./package might have dozens of installs done for it
-        and build a version of 0.0...and if we built and cached a wheel, we'd
-        end up using the same wheel even if the source has been edited.
-
-        :param link: The link of the sdist for which this will cache wheels.
-        """
-        parts = self._get_cache_path_parts(link)
-
-        # Store wheels within the root cache_dir
-        return os.path.join(self.cache_dir, "wheels", *parts)
-
-    def get(
-        self,
-        link,            # type: Link
-        package_name,    # type: Optional[str]
-        supported_tags,  # type: List[Tag]
-    ):
-        # type: (...) -> Link
-        candidates = []
-
-        if not package_name:
-            return link
-
-        canonical_package_name = canonicalize_name(package_name)
-        for wheel_name, wheel_dir in self._get_candidates(
-            link, canonical_package_name
-        ):
-            try:
-                wheel = Wheel(wheel_name)
-            except InvalidWheelFilename:
-                continue
-            if canonicalize_name(wheel.name) != canonical_package_name:
-                logger.debug(
-                    "Ignoring cached wheel {} for {} as it "
-                    "does not match the expected distribution name {}.".format(
-                        wheel_name, link, package_name
-                    )
-                )
-                continue
-            if not wheel.supported(supported_tags):
-                # Built for a different python/arch/etc
-                continue
-            candidates.append(
-                (
-                    wheel.support_index_min(supported_tags),
-                    wheel_name,
-                    wheel_dir,
-                )
-            )
-
-        if not candidates:
-            return link
-
-        _, wheel_name, wheel_dir = min(candidates)
-        return Link(path_to_url(os.path.join(wheel_dir, wheel_name)))
-
-
-class EphemWheelCache(SimpleWheelCache):
-    """A SimpleWheelCache that creates it's own temporary cache directory
-    """
-
-    def __init__(self, format_control):
-        # type: (FormatControl) -> None
-        self._temp_dir = TempDirectory(kind="ephem-wheel-cache")
-
-        super(EphemWheelCache, self).__init__(
-            self._temp_dir.path, format_control
-        )
-
-    def cleanup(self):
-        # type: () -> None
-        self._temp_dir.cleanup()
-
-
-class WheelCache(Cache):
-    """Wraps EphemWheelCache and SimpleWheelCache into a single Cache
-
-    This Cache allows for gracefully degradation, using the ephem wheel cache
-    when a certain link is not found in the simple wheel cache first.
-    """
-
-    def __init__(self, cache_dir, format_control):
-        # type: (str, FormatControl) -> None
-        super(WheelCache, self).__init__(
-            cache_dir, format_control, {'binary'}
-        )
-        self._wheel_cache = SimpleWheelCache(cache_dir, format_control)
-        self._ephem_cache = EphemWheelCache(format_control)
-
-    def get_path_for_link_legacy(self, link):
-        # type: (Link) -> str
-        return self._wheel_cache.get_path_for_link_legacy(link)
-
-    def get_path_for_link(self, link):
-        # type: (Link) -> str
-        return self._wheel_cache.get_path_for_link(link)
-
-    def get_ephem_path_for_link(self, link):
-        # type: (Link) -> str
-        return self._ephem_cache.get_path_for_link(link)
-
-    def get(
-        self,
-        link,            # type: Link
-        package_name,    # type: Optional[str]
-        supported_tags,  # type: List[Tag]
-    ):
-        # type: (...) -> Link
-        retval = self._wheel_cache.get(
-            link=link,
-            package_name=package_name,
-            supported_tags=supported_tags,
-        )
-        if retval is not link:
-            return retval
-
-        return self._ephem_cache.get(
-            link=link,
-            package_name=package_name,
-            supported_tags=supported_tags,
-        )
-
-    def cleanup(self):
-        # type: () -> None
-        self._wheel_cache.cleanup()
-        self._ephem_cache.cleanup()

-"""Subpackage containing all of pip's command line interface related code
-"""
-
-# This file intentionally does not import submodules

-"""Logic that powers autocompletion installed by ``pip completion``.
-"""
-
-import optparse
-import os
-import sys
-from itertools import chain
-
-from pip._internal.cli.main_parser import create_main_parser
-from pip._internal.commands import commands_dict, create_command
-from pip._internal.utils.misc import get_installed_distributions
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from typing import Any, Iterable, List, Optional
-
-
-def autocomplete():
-    # type: () -> None
-    """Entry Point for completion of main and subcommand options.
-    """
-    # Don't complete if user hasn't sourced bash_completion file.
-    if 'PIP_AUTO_COMPLETE' not in os.environ:
-        return
-    cwords = os.environ['COMP_WORDS'].split()[1:]
-    cword = int(os.environ['COMP_CWORD'])
-    try:
-        current = cwords[cword - 1]
-    except IndexError:
-        current = ''
-
-    parser = create_main_parser()
-    subcommands = list(commands_dict)
-    options = []
-
-    # subcommand
-    subcommand_name = None  # type: Optional[str]
-    for word in cwords:
-        if word in subcommands:
-            subcommand_name = word
-            break
-    # subcommand options
-    if subcommand_name is not None:
-        # special case: 'help' subcommand has no options
-        if subcommand_name == 'help':
-            sys.exit(1)
-        # special case: list locally installed dists for show and uninstall
-        should_list_installed = (
-            subcommand_name in ['show', 'uninstall'] and
-            not current.startswith('-')
-        )
-        if should_list_installed:
-            installed = []
-            lc = current.lower()
-            for dist in get_installed_distributions(local_only=True):
-                if dist.key.startswith(lc) and dist.key not in cwords[1:]:
-                    installed.append(dist.key)
-            # if there are no dists installed, fall back to option completion
-            if installed:
-                for dist in installed:
-                    print(dist)
-                sys.exit(1)
-
-        subcommand = create_command(subcommand_name)
-
-        for opt in subcommand.parser.option_list_all:
-            if opt.help != optparse.SUPPRESS_HELP:
-                for opt_str in opt._long_opts + opt._short_opts:
-                    options.append((opt_str, opt.nargs))
-
-        # filter out previously specified options from available options
-        prev_opts = [x.split('=')[0] for x in cwords[1:cword - 1]]
-        options = [(x, v) for (x, v) in options if x not in prev_opts]
-        # filter options by current input
-        options = [(k, v) for k, v in options if k.startswith(current)]
-        # get completion type given cwords and available subcommand options
-        completion_type = get_path_completion_type(
-            cwords, cword, subcommand.parser.option_list_all,
-        )
-        # get completion files and directories if ``completion_type`` is
-        # ``<file>``, ``<dir>`` or ``<path>``
-        if completion_type:
-            paths = auto_complete_paths(current, completion_type)
-            options = [(path, 0) for path in paths]
-        for option in options:
-            opt_label = option[0]
-            # append '=' to options which require args
-            if option[1] and option[0][:2] == "--":
-                opt_label += '='
-            print(opt_label)
-    else:
-        # show main parser options only when necessary
-
-        opts = [i.option_list for i in parser.option_groups]
-        opts.append(parser.option_list)
-        flattened_opts = chain.from_iterable(opts)
-        if current.startswith('-'):
-            for opt in flattened_opts:
-                if opt.help != optparse.SUPPRESS_HELP:
-                    subcommands += opt._long_opts + opt._short_opts
-        else:
-            # get completion type given cwords and all available options
-            completion_type = get_path_completion_type(cwords, cword,
-                                                       flattened_opts)
-            if completion_type:
-                subcommands = list(auto_complete_paths(current,
-                                                       completion_type))
-
-        print(' '.join([x for x in subcommands if x.startswith(current)]))
-    sys.exit(1)
-
-
-def get_path_completion_type(cwords, cword, opts):
-    # type: (List[str], int, Iterable[Any]) -> Optional[str]
-    """Get the type of path completion (``file``, ``dir``, ``path`` or None)
-
-    :param cwords: same as the environmental variable ``COMP_WORDS``
-    :param cword: same as the environmental variable ``COMP_CWORD``
-    :param opts: The available options to check
-    :return: path completion type (``file``, ``dir``, ``path`` or None)
-    """
-    if cword < 2 or not cwords[cword - 2].startswith('-'):
-        return None
-    for opt in opts:
-        if opt.help == optparse.SUPPRESS_HELP:
-            continue
-        for o in str(opt).split('/'):
-            if cwords[cword - 2].split('=')[0] == o:
-                if not opt.metavar or any(
-                        x in ('path', 'file', 'dir')
-                        for x in opt.metavar.split('/')):
-                    return opt.metavar
-    return None
-
-
-def auto_complete_paths(current, completion_type):
-    # type: (str, str) -> Iterable[str]
-    """If ``completion_type`` is ``file`` or ``path``, list all regular files
-    and directories starting with ``current``; otherwise only list directories
-    starting with ``current``.
-
-    :param current: The word to be completed
-    :param completion_type: path completion type(`file`, `path` or `dir`)i
-    :return: A generator of regular files and/or directories
-    """
-    directory, filename = os.path.split(current)
-    current_path = os.path.abspath(directory)
-    # Don't complete paths if they can't be accessed
-    if not os.access(current_path, os.R_OK):
-        return
-    filename = os.path.normcase(filename)
-    # list all files that start with ``filename``
-    file_list = (x for x in os.listdir(current_path)
-                 if os.path.normcase(x).startswith(filename))
-    for f in file_list:
-        opt = os.path.join(current_path, f)
-        comp_file = os.path.normcase(os.path.join(directory, f))
-        # complete regular files when there is not ``<dir>`` after option
-        # complete directories when there is ``<file>``, ``<path>`` or
-        # ``<dir>``after option
-        if completion_type != 'dir' and os.path.isfile(opt):
-            yield comp_file
-        elif os.path.isdir(opt):
-            yield os.path.join(comp_file, '')

-"""Base Command class, and related routines"""
-
-from __future__ import absolute_import, print_function
-
-import logging
-import logging.config
-import optparse
-import os
-import platform
-import sys
-import traceback
-
-from pip._internal.cli import cmdoptions
-from pip._internal.cli.command_context import CommandContextMixIn
-from pip._internal.cli.parser import (
-    ConfigOptionParser,
-    UpdatingDefaultsHelpFormatter,
-)
-from pip._internal.cli.status_codes import (
-    ERROR,
-    PREVIOUS_BUILD_DIR_ERROR,
-    SUCCESS,
-    UNKNOWN_ERROR,
-    VIRTUALENV_NOT_FOUND,
-)
-from pip._internal.exceptions import (
-    BadCommand,
-    CommandError,
-    InstallationError,
-    PreviousBuildDirError,
-    UninstallationError,
-)
-from pip._internal.utils.deprecation import deprecated
-from pip._internal.utils.filesystem import check_path_owner
-from pip._internal.utils.logging import BrokenStdoutLoggingError, setup_logging
-from pip._internal.utils.misc import get_prog, normalize_path
-from pip._internal.utils.temp_dir import global_tempdir_manager
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-from pip._internal.utils.virtualenv import running_under_virtualenv
-
-if MYPY_CHECK_RUNNING:
-    from typing import List, Tuple, Any
-    from optparse import Values
-
-__all__ = ['Command']
-
-logger = logging.getLogger(__name__)
-
-
-class Command(CommandContextMixIn):
-    usage = None  # type: str
-    ignore_require_venv = False  # type: bool
-
-    def __init__(self, name, summary, isolated=False):
-        # type: (str, str, bool) -> None
-        super(Command, self).__init__()
-        parser_kw = {
-            'usage': self.usage,
-            'prog': '%s %s' % (get_prog(), name),
-            'formatter': UpdatingDefaultsHelpFormatter(),
-            'add_help_option': False,
-            'name': name,
-            'description': self.__doc__,
-            'isolated': isolated,
-        }
-
-        self.name = name
-        self.summary = summary
-        self.parser = ConfigOptionParser(**parser_kw)
-
-        # Commands should add options to this option group
-        optgroup_name = '%s Options' % self.name.capitalize()
-        self.cmd_opts = optparse.OptionGroup(self.parser, optgroup_name)
-
-        # Add the general options
-        gen_opts = cmdoptions.make_option_group(
-            cmdoptions.general_group,
-            self.parser,
-        )
-        self.parser.add_option_group(gen_opts)
-
-    def handle_pip_version_check(self, options):
-        # type: (Values) -> None
-        """
-        This is a no-op so that commands by default do not do the pip version
-        check.
-        """
-        # Make sure we do the pip version check if the index_group options
-        # are present.
-        assert not hasattr(options, 'no_index')
-
-    def run(self, options, args):
-        # type: (Values, List[Any]) -> Any
-        raise NotImplementedError
-
-    def parse_args(self, args):
-        # type: (List[str]) -> Tuple[Any, Any]
-        # factored out for testability
-        return self.parser.parse_args(args)
-
-    def main(self, args):
-        # type: (List[str]) -> int
-        try:
-            with self.main_context():
-                return self._main(args)
-        finally:
-            logging.shutdown()
-
-    def _main(self, args):
-        # type: (List[str]) -> int
-        # Intentionally set as early as possible so globally-managed temporary
-        # directories are available to the rest of the code.
-        self.enter_context(global_tempdir_manager())
-
-        options, args = self.parse_args(args)
-
-        # Set verbosity so that it can be used elsewhere.
-        self.verbosity = options.verbose - options.quiet
-
-        level_number = setup_logging(
-            verbosity=self.verbosity,
-            no_color=options.no_color,
-            user_log_file=options.log,
-        )
-
-        if (
-            sys.version_info[:2] == (2, 7) and
-            not options.no_python_version_warning
-        ):
-            message = (
-                "A future version of pip will drop support for Python 2.7. "
-                "More details about Python 2 support in pip, can be found at "
-                "https://pip.pypa.io/en/latest/development/release-process/#python-2-support"  # noqa
-            )
-            if platform.python_implementation() == "CPython":
-                message = (
-                    "Python 2.7 reached the end of its life on January "
-                    "1st, 2020. Please upgrade your Python as Python 2.7 "
-                    "is no longer maintained. "
-                ) + message
-            deprecated(message, replacement=None, gone_in=None)
-
-        if options.skip_requirements_regex:
-            deprecated(
-                "--skip-requirements-regex is unsupported and will be removed",
-                replacement=(
-                    "manage requirements/constraints files explicitly, "
-                    "possibly generating them from metadata"
-                ),
-                gone_in="20.1",
-                issue=7297,
-            )
-
-        # TODO: Try to get these passing down from the command?
-        #       without resorting to os.environ to hold these.
-        #       This also affects isolated builds and it should.
-
-        if options.no_input:
-            os.environ['PIP_NO_INPUT'] = '1'
-
-        if options.exists_action:
-            os.environ['PIP_EXISTS_ACTION'] = ' '.join(options.exists_action)
-
-        if options.require_venv and not self.ignore_require_venv:
-            # If a venv is required check if it can really be found
-            if not running_under_virtualenv():
-                logger.critical(
-                    'Could not find an activated virtualenv (required).'
-                )
-                sys.exit(VIRTUALENV_NOT_FOUND)
-
-        if options.cache_dir:
-            options.cache_dir = normalize_path(options.cache_dir)
-            if not check_path_owner(options.cache_dir):
-                logger.warning(
-                    "The directory '%s' or its parent directory is not owned "
-                    "or is not writable by the current user. The cache "
-                    "has been disabled. Check the permissions and owner of "
-                    "that directory. If executing pip with sudo, you may want "
-                    "sudo's -H flag.",
-                    options.cache_dir,
-                )
-                options.cache_dir = None
-
-        try:
-            status = self.run(options, args)
-            # FIXME: all commands should return an exit status
-            # and when it is done, isinstance is not needed anymore
-            if isinstance(status, int):
-                return status
-        except PreviousBuildDirError as exc:
-            logger.critical(str(exc))
-            logger.debug('Exception information:', exc_info=True)
-
-            return PREVIOUS_BUILD_DIR_ERROR
-        except (InstallationError, UninstallationError, BadCommand) as exc:
-            logger.critical(str(exc))
-            logger.debug('Exception information:', exc_info=True)
-
-            return ERROR
-        except CommandError as exc:
-            logger.critical('%s', exc)
-            logger.debug('Exception information:', exc_info=True)
-
-            return ERROR
-        except BrokenStdoutLoggingError:
-            # Bypass our logger and write any remaining messages to stderr
-            # because stdout no longer works.
-            print('ERROR: Pipe to stdout was broken', file=sys.stderr)
-            if level_number <= logging.DEBUG:
-                traceback.print_exc(file=sys.stderr)
-
-            return ERROR
-        except KeyboardInterrupt:
-            logger.critical('Operation cancelled by user')
-            logger.debug('Exception information:', exc_info=True)
-
-            return ERROR
-        except BaseException:
-            logger.critical('Exception:', exc_info=True)
-
-            return UNKNOWN_ERROR
-        finally:
-            self.handle_pip_version_check(options)
-
-        return SUCCESS

-"""
-shared options and groups
-
-The principle here is to define options once, but *not* instantiate them
-globally. One reason being that options with action='append' can carry state
-between parses. pip parses general options twice internally, and shouldn't
-pass on state. To be consistent, all options will follow this design.
-"""
-
-# The following comment should be removed at some point in the future.
-# mypy: strict-optional=False
-
-from __future__ import absolute_import
-
-import logging
-import os
-import textwrap
-import warnings
-from distutils.util import strtobool
-from functools import partial
-from optparse import SUPPRESS_HELP, Option, OptionGroup
-from textwrap import dedent
-
-from pip._internal.exceptions import CommandError
-from pip._internal.locations import USER_CACHE_DIR, get_src_prefix
-from pip._internal.models.format_control import FormatControl
-from pip._internal.models.index import PyPI
-from pip._internal.models.target_python import TargetPython
-from pip._internal.utils.hashes import STRONG_HASHES
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-from pip._internal.utils.ui import BAR_TYPES
-
-if MYPY_CHECK_RUNNING:
-    from typing import Any, Callable, Dict, Optional, Tuple
-    from optparse import OptionParser, Values
-    from pip._internal.cli.parser import ConfigOptionParser
-
-logger = logging.getLogger(__name__)
-
-
-def raise_option_error(parser, option, msg):
-    # type: (OptionParser, Option, str) -> None
-    """
-    Raise an option parsing error using parser.error().
-
-    Args:
-      parser: an OptionParser instance.
-      option: an Option instance.
-      msg: the error text.
-    """
-    msg = '{} error: {}'.format(option, msg)
-    msg = textwrap.fill(' '.join(msg.split()))
-    parser.error(msg)
-
-
-def make_option_group(group, parser):
-    # type: (Dict[str, Any], ConfigOptionParser) -> OptionGroup
-    """
-    Return an OptionGroup object
-    group  -- assumed to be dict with 'name' and 'options' keys
-    parser -- an optparse Parser
-    """
-    option_group = OptionGroup(parser, group['name'])
-    for option in group['options']:
-        option_group.add_option(option())
-    return option_group
-
-
-def check_install_build_global(options, check_options=None):
-    # type: (Values, Optional[Values]) -> None
-    """Disable wheels if per-setup.py call options are set.
-
-    :param options: The OptionParser options to update.
-    :param check_options: The options to check, if not supplied defaults to
-        options.
-    """
-    if check_options is None:
-        check_options = options
-
-    def getname(n):
-        # type: (str) -> Optional[Any]
-        return getattr(check_options, n, None)
-    names = ["build_options", "global_options", "install_options"]
-    if any(map(getname, names)):
-        control = options.format_control
-        control.disallow_binaries()
-        warnings.warn(
-            'Disabling all use of wheels due to the use of --build-option '
-            '/ --global-option / --install-option.', stacklevel=2,
-        )
-
-
-def check_dist_restriction(options, check_target=False):
-    # type: (Values, bool) -> None
-    """Function for determining if custom platform options are allowed.
-
-    :param options: The OptionParser options.
-    :param check_target: Whether or not to check if --target is being used.
-    """
-    dist_restriction_set = any([
-        options.python_version,
-        options.platform,
-        options.abi,
-        options.implementation,
-    ])
-
-    binary_only = FormatControl(set(), {':all:'})
-    sdist_dependencies_allowed = (
-        options.format_control != binary_only and
-        not options.ignore_dependencies
-    )
-
-    # Installations or downloads using dist restrictions must not combine
-    # source distributions and dist-specific wheels, as they are not
-    # guaranteed to be locally compatible.
-    if dist_restriction_set and sdist_dependencies_allowed:
-        raise CommandError(
-            "When restricting platform and interpreter constraints using "
-            "--python-version, --platform, --abi, or --implementation, "
-            "either --no-deps must be set, or --only-binary=:all: must be "
-            "set and --no-binary must not be set (or must be set to "
-            ":none:)."
-        )
-
-    if check_target:
-        if dist_restriction_set and not options.target_dir:
-            raise CommandError(
-                "Can not use any platform or abi specific options unless "
-                "installing via '--target'"
-            )
-
-
-def _path_option_check(option, opt, value):
-    # type: (Option, str, str) -> str
-    return os.path.expanduser(value)
-
-
-class PipOption(Option):
-    TYPES = Option.TYPES + ("path",)
-    TYPE_CHECKER = Option.TYPE_CHECKER.copy()
-    TYPE_CHECKER["path"] = _path_option_check
-
-
-###########
-# options #
-###########
-
-help_ = partial(
-    Option,
-    '-h', '--help',
-    dest='help',
-    action='help',
-    help='Show help.',
-)  # type: Callable[..., Option]
-
-isolated_mode = partial(
-    Option,
-    "--isolated",
-    dest="isolated_mode",
-    action="store_true",
-    default=False,
-    help=(
-        "Run pip in an isolated mode, ignoring environment variables and user "
-        "configuration."
-    ),
-)  # type: Callable[..., Option]
-
-require_virtualenv = partial(
-    Option,
-    # Run only if inside a virtualenv, bail if not.
-    '--require-virtualenv', '--require-venv',
-    dest='require_venv',
-    action='store_true',
-    default=False,
-    help=SUPPRESS_HELP
-)  # type: Callable[..., Option]
-
-verbose = partial(
-    Option,
-    '-v', '--verbose',
-    dest='verbose',
-    action='count',
-    default=0,
-    help='Give more output. Option is additive, and can be used up to 3 times.'
-)  # type: Callable[..., Option]
-
-no_color = partial(
-    Option,
-    '--no-color',
-    dest='no_color',
-    action='store_true',
-    default=False,
-    help="Suppress colored output",
-)  # type: Callable[..., Option]
-
-version = partial(
-    Option,
-    '-V', '--version',
-    dest='version',
-    action='store_true',
-    help='Show version and exit.',
-)  # type: Callable[..., Option]
-
-quiet = partial(
-    Option,
-    '-q', '--quiet',
-    dest='quiet',
-    action='count',
-    default=0,
-    help=(
-        'Give less output. Option is additive, and can be used up to 3'
-        ' times (corresponding to WARNING, ERROR, and CRITICAL logging'
-        ' levels).'
-    ),
-)  # type: Callable[..., Option]
-
-progress_bar = partial(
-    Option,
-    '--progress-bar',
-    dest='progress_bar',
-    type='choice',
-    choices=list(BAR_TYPES.keys()),
-    default='on',
-    help=(
-        'Specify type of progress to be displayed [' +
-        '|'.join(BAR_TYPES.keys()) + '] (default: %default)'
-    ),
-)  # type: Callable[..., Option]
-
-log = partial(
-    PipOption,
-    "--log", "--log-file", "--local-log",
-    dest="log",
-    metavar="path",
-    type="path",
-    help="Path to a verbose appending log."
-)  # type: Callable[..., Option]
-
-no_input = partial(
-    Option,
-    # Don't ask for input
-    '--no-input',
-    dest='no_input',
-    action='store_true',
-    default=False,
-    help=SUPPRESS_HELP
-)  # type: Callable[..., Option]
-
-proxy = partial(
-    Option,
-    '--proxy',
-    dest='proxy',
-    type='str',
-    default='',
-    help="Specify a proxy in the form [user:passwd@]proxy.server:port."
-)  # type: Callable[..., Option]
-
-retries = partial(
-    Option,
-    '--retries',
-    dest='retries',
-    type='int',
-    default=5,
-    help="Maximum number of retries each connection should attempt "
-         "(default %default times).",
-)  # type: Callable[..., Option]
-
-timeout = partial(
-    Option,
-    '--timeout', '--default-timeout',
-    metavar='sec',
-    dest='timeout',
-    type='float',
-    default=15,
-    help='Set the socket timeout (default %default seconds).',
-)  # type: Callable[..., Option]
-
-skip_requirements_regex = partial(
-    Option,
-    # A regex to be used to skip requirements
-    '--skip-requirements-regex',
-    dest='skip_requirements_regex',
-    type='str',
-    default='',
-    help=SUPPRESS_HELP,
-)  # type: Callable[..., Option]
-
-
-def exists_action():
-    # type: () -> Option
-    return Option(
-        # Option when path already exist
-        '--exists-action',
-        dest='exists_action',
-        type='choice',
-        choices=['s', 'i', 'w', 'b', 'a'],
-        default=[],
-        action='append',
-        metavar='action',
-        help="Default action when a path already exists: "
-             "(s)witch, (i)gnore, (w)ipe, (b)ackup, (a)bort.",
-    )
-
-
-cert = partial(
-    PipOption,
-    '--cert',
-    dest='cert',
-    type='path',
-    metavar='path',
-    help="Path to alternate CA bundle.",
-)  # type: Callable[..., Option]
-
-client_cert = partial(
-    PipOption,
-    '--client-cert',
-    dest='client_cert',
-    type='path',
-    default=None,
-    metavar='path',
-    help="Path to SSL client certificate, a single file containing the "
-         "private key and the certificate in PEM format.",
-)  # type: Callable[..., Option]
-
-index_url = partial(
-    Option,
-    '-i', '--index-url', '--pypi-url',
-    dest='index_url',
-    metavar='URL',
-    default=PyPI.simple_url,
-    help="Base URL of the Python Package Index (default %default). "
-         "This should point to a repository compliant with PEP 503 "
-         "(the simple repository API) or a local directory laid out "
-         "in the same format.",
-)  # type: Callable[..., Option]
-
-
-def extra_index_url():
-    # type: () -> Option
-    return Option(
-        '--extra-index-url',
-        dest='extra_index_urls',
-        metavar='URL',
-        action='append',
-        default=[],
-        help="Extra URLs of package indexes to use in addition to "
-             "--index-url. Should follow the same rules as "
-             "--index-url.",
-    )
-
-
-no_index = partial(
-    Option,
-    '--no-index',
-    dest='no_index',
-    action='store_true',
-    default=False,
-    help='Ignore package index (only looking at --find-links URLs instead).',
-)  # type: Callable[..., Option]
-
-
-def find_links():
-    # type: () -> Option
-    return Option(
-        '-f', '--find-links',
-        dest='find_links',
-        action='append',
-        default=[],
-        metavar='url',
-        help="If a url or path to an html file, then parse for links to "
-             "archives. If a local path or file:// url that's a directory, "
-             "then look for archives in the directory listing.",
-    )
-
-
-def trusted_host():
-    # type: () -> Option
-    return Option(
-        "--trusted-host",
-        dest="trusted_hosts",
-        action="append",
-        metavar="HOSTNAME",
-        default=[],
-        help="Mark this host or host:port pair as trusted, even though it "
-             "does not have valid or any HTTPS.",
-    )
-
-
-def constraints():
-    # type: () -> Option
-    return Option(
-        '-c', '--constraint',
-        dest='constraints',
-        action='append',
-        default=[],
-        metavar='file',
-        help='Constrain versions using the given constraints file. '
-        'This option can be used multiple times.'
-    )
-
-
-def requirements():
-    # type: () -> Option
-    return Option(
-        '-r', '--requirement',
-        dest='requirements',
-        action='append',
-        default=[],
-        metavar='file',
-        help='Install from the given requirements file. '
-        'This option can be used multiple times.'
-    )
-
-
-def editable():
-    # type: () -> Option
-    return Option(
-        '-e', '--editable',
-        dest='editables',
-        action='append',
-        default=[],
-        metavar='path/url',
-        help=('Install a project in editable mode (i.e. setuptools '
-              '"develop mode") from a local project path or a VCS url.'),
-    )
-
-
-def _handle_src(option, opt_str, value, parser):
-    # type: (Option, str, str, OptionParser) -> None
-    value = os.path.abspath(value)
-    setattr(parser.values, option.dest, value)
-
-
-src = partial(
-    PipOption,
-    '--src', '--source', '--source-dir', '--source-directory',
-    dest='src_dir',
-    type='path',
-    metavar='dir',
-    default=get_src_prefix(),
-    action='callback',
-    callback=_handle_src,
-    help='Directory to check out editable projects into. '
-    'The default in a virtualenv is "<venv path>/src". '
-    'The default for global installs is "<current dir>/src".'
-)  # type: Callable[..., Option]
-
-
-def _get_format_control(values, option):
-    # type: (Values, Option) -> Any
-    """Get a format_control object."""
-    return getattr(values, option.dest)
-
-
-def _handle_no_binary(option, opt_str, value, parser):
-    # type: (Option, str, str, OptionParser) -> None
-    existing = _get_format_control(parser.values, option)
-    FormatControl.handle_mutual_excludes(
-        value, existing.no_binary, existing.only_binary,
-    )
-
-
-def _handle_only_binary(option, opt_str, value, parser):
-    # type: (Option, str, str, OptionParser) -> None
-    existing = _get_format_control(parser.values, option)
-    FormatControl.handle_mutual_excludes(
-        value, existing.only_binary, existing.no_binary,
-    )
-
-
-def no_binary():
-    # type: () -> Option
-    format_control = FormatControl(set(), set())
-    return Option(
-        "--no-binary", dest="format_control", action="callback",
-        callback=_handle_no_binary, type="str",
-        default=format_control,
-        help="Do not use binary packages. Can be supplied multiple times, and "
-             "each time adds to the existing value. Accepts either :all: to "
-             "disable all binary packages, :none: to empty the set, or one or "
-             "more package names with commas between them (no colons). Note "
-             "that some packages are tricky to compile and may fail to "
-             "install when this option is used on them.",
-    )
-
-
-def only_binary():
-    # type: () -> Option
-    format_control = FormatControl(set(), set())
-    return Option(
-        "--only-binary", dest="format_control", action="callback",
-        callback=_handle_only_binary, type="str",
-        default=format_control,
-        help="Do not use source packages. Can be supplied multiple times, and "
-             "each time adds to the existing value. Accepts either :all: to "
-             "disable all source packages, :none: to empty the set, or one or "
-             "more package names with commas between them. Packages without "
-             "binary distributions will fail to install when this option is "
-             "used on them.",
-    )
-
-
-platform = partial(
-    Option,
-    '--platform',
-    dest='platform',
-    metavar='platform',
-    default=None,
-    help=("Only use wheels compatible with <platform>. "
-          "Defaults to the platform of the running system."),
-)  # type: Callable[..., Option]
-
-
-# This was made a separate function for unit-testing purposes.
-def _convert_python_version(value):
-    # type: (str) -> Tuple[Tuple[int, ...], Optional[str]]
-    """
-    Convert a version string like "3", "37", or "3.7.3" into a tuple of ints.
-
-    :return: A 2-tuple (version_info, error_msg), where `error_msg` is
-        non-None if and only if there was a parsing error.
-    """
-    if not value:
-        # The empty string is the same as not providing a value.
-        return (None, None)
-
-    parts = value.split('.')
-    if len(parts) > 3:
-        return ((), 'at most three version parts are allowed')
-
-    if len(parts) == 1:
-        # Then we are in the case of "3" or "37".
-        value = parts[0]
-        if len(value) > 1:
-            parts = [value[0], value[1:]]
-
-    try:
-        version_info = tuple(int(part) for part in parts)
-    except ValueError:
-        return ((), 'each version part must be an integer')
-
-    return (version_info, None)
-
-
-def _handle_python_version(option, opt_str, value, parser):
-    # type: (Option, str, str, OptionParser) -> None
-    """
-    Handle a provided --python-version value.
-    """
-    version_info, error_msg = _convert_python_version(value)
-    if error_msg is not None:
-        msg = (
-            'invalid --python-version value: {!r}: {}'.format(
-                value, error_msg,
-            )
-        )
-        raise_option_error(parser, option=option, msg=msg)
-
-    parser.values.python_version = version_info
-
-
-python_version = partial(
-    Option,
-    '--python-version',
-    dest='python_version',
-    metavar='python_version',
-    action='callback',
-    callback=_handle_python_version, type='str',
-    default=None,
-    help=dedent("""\
-    The Python interpreter version to use for wheel and "Requires-Python"
-    compatibility checks. Defaults to a version derived from the running
-    interpreter. The version can be specified using up to three dot-separated
-    integers (e.g. "3" for 3.0.0, "3.7" for 3.7.0, or "3.7.3"). A major-minor
-    version can also be given as a string without dots (e.g. "37" for 3.7.0).
-    """),
-)  # type: Callable[..., Option]
-
-
-implementation = partial(
-    Option,
-    '--implementation',
-    dest='implementation',
-    metavar='implementation',
-    default=None,
-    help=("Only use wheels compatible with Python "
-          "implementation <implementation>, e.g. 'pp', 'jy', 'cp', "
-          " or 'ip'. If not specified, then the current "
-          "interpreter implementation is used.  Use 'py' to force "
-          "implementation-agnostic wheels."),
-)  # type: Callable[..., Option]
-
-
-abi = partial(
-    Option,
-    '--abi',
-    dest='abi',
-    metavar='abi',
-    default=None,
-    help=("Only use wheels compatible with Python "
-          "abi <abi>, e.g. 'pypy_41'.  If not specified, then the "
-          "current interpreter abi tag is used.  Generally "
-          "you will need to specify --implementation, "
-          "--platform, and --python-version when using "
-          "this option."),
-)  # type: Callable[..., Option]
-
-
-def add_target_python_options(cmd_opts):
-    # type: (OptionGroup) -> None
-    cmd_opts.add_option(platform())
-    cmd_opts.add_option(python_version())
-    cmd_opts.add_option(implementation())
-    cmd_opts.add_option(abi())
-
-
-def make_target_python(options):
-    # type: (Values) -> TargetPython
-    target_python = TargetPython(
-        platform=options.platform,
-        py_version_info=options.python_version,
-        abi=options.abi,
-        implementation=options.implementation,
-    )
-
-    return target_python
-
-
-def prefer_binary():
-    # type: () -> Option
-    return Option(
-        "--prefer-binary",
-        dest="prefer_binary",
-        action="store_true",
-        default=False,
-        help="Prefer older binary packages over newer source packages."
-    )
-
-
-cache_dir = partial(
-    PipOption,
-    "--cache-dir",
-    dest="cache_dir",
-    default=USER_CACHE_DIR,
-    metavar="dir",
-    type='path',
-    help="Store the cache data in <dir>."
-)  # type: Callable[..., Option]
-
-
-def _handle_no_cache_dir(option, opt, value, parser):
-    # type: (Option, str, str, OptionParser) -> None
-    """
-    Process a value provided for the --no-cache-dir option.
-
-    This is an optparse.Option callback for the --no-cache-dir option.
-    """
-    # The value argument will be None if --no-cache-dir is passed via the
-    # command-line, since the option doesn't accept arguments.  However,
-    # the value can be non-None if the option is triggered e.g. by an
-    # environment variable, like PIP_NO_CACHE_DIR=true.
-    if value is not None:
-        # Then parse the string value to get argument error-checking.
-        try:
-            strtobool(value)
-        except ValueError as exc:
-            raise_option_error(parser, option=option, msg=str(exc))
-
-    # Originally, setting PIP_NO_CACHE_DIR to a value that strtobool()
-    # converted to 0 (like "false" or "no") caused cache_dir to be disabled
-    # rather than enabled (logic would say the latter).  Thus, we disable
-    # the cache directory not just on values that parse to True, but (for
-    # backwards compatibility reasons) also on values that parse to False.
-    # In other words, always set it to False if the option is provided in
-    # some (valid) form.
-    parser.values.cache_dir = False
-
-
-no_cache = partial(
-    Option,
-    "--no-cache-dir",
-    dest="cache_dir",
-    action="callback",
-    callback=_handle_no_cache_dir,
-    help="Disable the cache.",
-)  # type: Callable[..., Option]
-
-no_deps = partial(
-    Option,
-    '--no-deps', '--no-dependencies',
-    dest='ignore_dependencies',
-    action='store_true',
-    default=False,
-    help="Don't install package dependencies.",
-)  # type: Callable[..., Option]
-
-
-def _handle_build_dir(option, opt, value, parser):
-    # type: (Option, str, str, OptionParser) -> None
-    if value:
-        value = os.path.abspath(value)
-    setattr(parser.values, option.dest, value)
-
-
-build_dir = partial(
-    PipOption,
-    '-b', '--build', '--build-dir', '--build-directory',
-    dest='build_dir',
-    type='path',
-    metavar='dir',
-    action='callback',
-    callback=_handle_build_dir,
-    help='Directory to unpack packages into and build in. Note that '
-         'an initial build still takes place in a temporary directory. '
-         'The location of temporary directories can be controlled by setting '
-         'the TMPDIR environment variable (TEMP on Windows) appropriately. '
-         'When passed, build directories are not cleaned in case of failures.'
-)  # type: Callable[..., Option]
-
-ignore_requires_python = partial(
-    Option,
-    '--ignore-requires-python',
-    dest='ignore_requires_python',
-    action='store_true',
-    help='Ignore the Requires-Python information.'
-)  # type: Callable[..., Option]
-
-no_build_isolation = partial(
-    Option,
-    '--no-build-isolation',
-    dest='build_isolation',
-    action='store_false',
-    default=True,
-    help='Disable isolation when building a modern source distribution. '
-         'Build dependencies specified by PEP 518 must be already installed '
-         'if this option is used.'
-)  # type: Callable[..., Option]
-
-
-def _handle_no_use_pep517(option, opt, value, parser):
-    # type: (Option, str, str, OptionParser) -> None
-    """
-    Process a value provided for the --no-use-pep517 option.
-
-    This is an optparse.Option callback for the no_use_pep517 option.
-    """
-    # Since --no-use-pep517 doesn't accept arguments, the value argument
-    # will be None if --no-use-pep517 is passed via the command-line.
-    # However, the value can be non-None if the option is triggered e.g.
-    # by an environment variable, for example "PIP_NO_USE_PEP517=true".
-    if value is not None:
-        msg = """A value was passed for --no-use-pep517,
-        probably using either the PIP_NO_USE_PEP517 environment variable
-        or the "no-use-pep517" config file option. Use an appropriate value
-        of the PIP_USE_PEP517 environment variable or the "use-pep517"
-        config file option instead.
-        """
-        raise_option_error(parser, option=option, msg=msg)
-
-    # Otherwise, --no-use-pep517 was passed via the command-line.
-    parser.values.use_pep517 = False
-
-
-use_pep517 = partial(
-    Option,
-    '--use-pep517',
-    dest='use_pep517',
-    action='store_true',
-    default=None,
-    help='Use PEP 517 for building source distributions '
-         '(use --no-use-pep517 to force legacy behaviour).'
-)  # type: Any
-
-no_use_pep517 = partial(
-    Option,
-    '--no-use-pep517',
-    dest='use_pep517',
-    action='callback',
-    callback=_handle_no_use_pep517,
-    default=None,
-    help=SUPPRESS_HELP
-)  # type: Any
-
-install_options = partial(
-    Option,
-    '--install-option',
-    dest='install_options',
-    action='append',
-    metavar='options',
-    help="Extra arguments to be supplied to the setup.py install "
-         "command (use like --install-option=\"--install-scripts=/usr/local/"
-         "bin\"). Use multiple --install-option options to pass multiple "
-         "options to setup.py install. If you are using an option with a "
-         "directory path, be sure to use absolute path.",
-)  # type: Callable[..., Option]
-
-global_options = partial(
-    Option,
-    '--global-option',
-    dest='global_options',
-    action='append',
-    metavar='options',
-    help="Extra global options to be supplied to the setup.py "
-         "call before the install command.",
-)  # type: Callable[..., Option]
-
-no_clean = partial(
-    Option,
-    '--no-clean',
-    action='store_true',
-    default=False,
-    help="Don't clean up build directories."
-)  # type: Callable[..., Option]
-
-pre = partial(
-    Option,
-    '--pre',
-    action='store_true',
-    default=False,
-    help="Include pre-release and development versions. By default, "
-         "pip only finds stable versions.",
-)  # type: Callable[..., Option]
-
-disable_pip_version_check = partial(
-    Option,
-    "--disable-pip-version-check",
-    dest="disable_pip_version_check",
-    action="store_true",
-    default=True,
-    help="Don't periodically check PyPI to determine whether a new version "
-         "of pip is available for download. Implied with --no-index.",
-)  # type: Callable[..., Option]
-
-
-# Deprecated, Remove later
-always_unzip = partial(
-    Option,
-    '-Z', '--always-unzip',
-    dest='always_unzip',
-    action='store_true',
-    help=SUPPRESS_HELP,
-)  # type: Callable[..., Option]
-
-
-def _handle_merge_hash(option, opt_str, value, parser):
-    # type: (Option, str, str, OptionParser) -> None
-    """Given a value spelled "algo:digest", append the digest to a list
-    pointed to in a dict by the algo name."""
-    if not parser.values.hashes:
-        parser.values.hashes = {}
-    try:
-        algo, digest = value.split(':', 1)
-    except ValueError:
-        parser.error('Arguments to %s must be a hash name '
-                     'followed by a value, like --hash=sha256:abcde...' %
-                     opt_str)
-    if algo not in STRONG_HASHES:
-        parser.error('Allowed hash algorithms for %s are %s.' %
-                     (opt_str, ', '.join(STRONG_HASHES)))
-    parser.values.hashes.setdefault(algo, []).append(digest)
-
-
-hash = partial(
-    Option,
-    '--hash',
-    # Hash values eventually end up in InstallRequirement.hashes due to
-    # __dict__ copying in process_line().
-    dest='hashes',
-    action='callback',
-    callback=_handle_merge_hash,
-    type='string',
-    help="Verify that the package's archive matches this "
-         'hash before installing. Example: --hash=sha256:abcdef...',
-)  # type: Callable[..., Option]
-
-
-require_hashes = partial(
-    Option,
-    '--require-hashes',
-    dest='require_hashes',
-    action='store_true',
-    default=False,
-    help='Require a hash to check each requirement against, for '
-         'repeatable installs. This option is implied when any package in a '
-         'requirements file has a --hash option.',
-)  # type: Callable[..., Option]
-
-
-list_path = partial(
-    PipOption,
-    '--path',
-    dest='path',
-    type='path',
-    action='append',
-    help='Restrict to the specified installation path for listing '
-         'packages (can be used multiple times).'
-)  # type: Callable[..., Option]
-
-
-def check_list_path_option(options):
-    # type: (Values) -> None
-    if options.path and (options.user or options.local):
-        raise CommandError(
-            "Cannot combine '--path' with '--user' or '--local'"
-        )
-
-
-no_python_version_warning = partial(
-    Option,
-    '--no-python-version-warning',
-    dest='no_python_version_warning',
-    action='store_true',
-    default=False,
-    help='Silence deprecation warnings for upcoming unsupported Pythons.',
-)  # type: Callable[..., Option]
-
-
-##########
-# groups #
-##########
-
-general_group = {
-    'name': 'General Options',
-    'options': [
-        help_,
-        isolated_mode,
-        require_virtualenv,
-        verbose,
-        version,
-        quiet,
-        log,
-        no_input,
-        proxy,
-        retries,
-        timeout,
-        skip_requirements_regex,
-        exists_action,
-        trusted_host,
-        cert,
-        client_cert,
-        cache_dir,
-        no_cache,
-        disable_pip_version_check,
-        no_color,
-        no_python_version_warning,
-    ]
-}  # type: Dict[str, Any]
-
-index_group = {
-    'name': 'Package Index Options',
-    'options': [
-        index_url,
-        extra_index_url,
-        no_index,
-        find_links,
-    ]
-}  # type: Dict[str, Any]

-from contextlib import contextmanager
-
-from pip._vendor.contextlib2 import ExitStack
-
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from typing import Iterator, ContextManager, TypeVar
-
-    _T = TypeVar('_T', covariant=True)
-
-
-class CommandContextMixIn(object):
-    def __init__(self):
-        # type: () -> None
-        super(CommandContextMixIn, self).__init__()
-        self._in_main_context = False
-        self._main_context = ExitStack()
-
-    @contextmanager
-    def main_context(self):
-        # type: () -> Iterator[None]
-        assert not self._in_main_context
-
-        self._in_main_context = True
-        try:
-            with self._main_context:
-                yield
-        finally:
-            self._in_main_context = False
-
-    def enter_context(self, context_provider):
-        # type: (ContextManager[_T]) -> _T
-        assert self._in_main_context
-
-        return self._main_context.enter_context(context_provider)

-"""Primary application entrypoint.
-"""
-from __future__ import absolute_import
-
-import locale
-import logging
-import os
-import sys
-
-from pip._internal.cli.autocompletion import autocomplete
-from pip._internal.cli.main_parser import parse_command
-from pip._internal.commands import create_command
-from pip._internal.exceptions import PipError
-from pip._internal.utils import deprecation
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from typing import List, Optional
-
-logger = logging.getLogger(__name__)
-
-
-# Do not import and use main() directly! Using it directly is actively
-# discouraged by pip's maintainers. The name, location and behavior of
-# this function is subject to change, so calling it directly is not
-# portable across different pip versions.
-
-# In addition, running pip in-process is unsupported and unsafe. This is
-# elaborated in detail at
-# https://pip.pypa.io/en/stable/user_guide/#using-pip-from-your-program.
-# That document also provides suggestions that should work for nearly
-# all users that are considering importing and using main() directly.
-
-# However, we know that certain users will still want to invoke pip
-# in-process. If you understand and accept the implications of using pip
-# in an unsupported manner, the best approach is to use runpy to avoid
-# depending on the exact location of this entry point.
-
-# The following example shows how to use runpy to invoke pip in that
-# case:
-#
-#     sys.argv = ["pip", your, args, here]
-#     runpy.run_module("pip", run_name="__main__")
-#
-# Note that this will exit the process after running, unlike a direct
-# call to main. As it is not safe to do any processing after calling
-# main, this should not be an issue in practice.
-
-def main(args=None):
-    # type: (Optional[List[str]]) -> int
-    if args is None:
-        args = sys.argv[1:]
-
-    # Configure our deprecation warnings to be sent through loggers
-    deprecation.install_warning_logger()
-
-    autocomplete()
-
-    try:
-        cmd_name, cmd_args = parse_command(args)
-    except PipError as exc:
-        sys.stderr.write("ERROR: %s" % exc)
-        sys.stderr.write(os.linesep)
-        sys.exit(1)
-
-    # Needed for locale.getpreferredencoding(False) to work
-    # in pip._internal.utils.encoding.auto_decode
-    try:
-        locale.setlocale(locale.LC_ALL, '')
-    except locale.Error as e:
-        # setlocale can apparently crash if locale are uninitialized
-        logger.debug("Ignoring error %s when setting locale", e)
-    command = create_command(cmd_name, isolated=("--isolated" in cmd_args))
-
-    return command.main(cmd_args)

-"""A single place for constructing and exposing the main parser
-"""
-
-import os
-import sys
-
-from pip._internal.cli import cmdoptions
-from pip._internal.cli.parser import (
-    ConfigOptionParser,
-    UpdatingDefaultsHelpFormatter,
-)
-from pip._internal.commands import commands_dict, get_similar_commands
-from pip._internal.exceptions import CommandError
-from pip._internal.utils.misc import get_pip_version, get_prog
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from typing import Tuple, List
-
-
-__all__ = ["create_main_parser", "parse_command"]
-
-
-def create_main_parser():
-    # type: () -> ConfigOptionParser
-    """Creates and returns the main parser for pip's CLI
-    """
-
-    parser_kw = {
-        'usage': '\n%prog <command> [options]',
-        'add_help_option': False,
-        'formatter': UpdatingDefaultsHelpFormatter(),
-        'name': 'global',
-        'prog': get_prog(),
-    }
-
-    parser = ConfigOptionParser(**parser_kw)
-    parser.disable_interspersed_args()
-
-    parser.version = get_pip_version()
-
-    # add the general options
-    gen_opts = cmdoptions.make_option_group(cmdoptions.general_group, parser)
-    parser.add_option_group(gen_opts)
-
-    # so the help formatter knows
-    parser.main = True  # type: ignore
-
-    # create command listing for description
-    description = [''] + [
-        '%-27s %s' % (name, command_info.summary)
-        for name, command_info in commands_dict.items()
-    ]
-    parser.description = '\n'.join(description)
-
-    return parser
-
-
-def parse_command(args):
-    # type: (List[str]) -> Tuple[str, List[str]]
-    parser = create_main_parser()
-
-    # Note: parser calls disable_interspersed_args(), so the result of this
-    # call is to split the initial args into the general options before the
-    # subcommand and everything else.
-    # For example:
-    #  args: ['--timeout=5', 'install', '--user', 'INITools']
-    #  general_options: ['--timeout==5']
-    #  args_else: ['install', '--user', 'INITools']
-    general_options, args_else = parser.parse_args(args)
-
-    # --version
-    if general_options.version:
-        sys.stdout.write(parser.version)  # type: ignore
-        sys.stdout.write(os.linesep)
-        sys.exit()
-
-    # pip || pip help -> print_help()
-    if not args_else or (args_else[0] == 'help' and len(args_else) == 1):
-        parser.print_help()
-        sys.exit()
-
-    # the subcommand name
-    cmd_name = args_else[0]
-
-    if cmd_name not in commands_dict:
-        guess = get_similar_commands(cmd_name)
-
-        msg = ['unknown command "%s"' % cmd_name]
-        if guess:
-            msg.append('maybe you meant "%s"' % guess)
-
-        raise CommandError(' - '.join(msg))
-
-    # all the args without the subcommand
-    cmd_args = args[:]
-    cmd_args.remove(cmd_name)
-
-    return cmd_name, cmd_args

-"""Base option parser setup"""
-
-# The following comment should be removed at some point in the future.
-# mypy: disallow-untyped-defs=False
-
-from __future__ import absolute_import
-
-import logging
-import optparse
-import sys
-import textwrap
-from distutils.util import strtobool
-
-from pip._vendor.six import string_types
-
-from pip._internal.cli.status_codes import UNKNOWN_ERROR
-from pip._internal.configuration import Configuration, ConfigurationError
-from pip._internal.utils.compat import get_terminal_size
-
-logger = logging.getLogger(__name__)
-
-
-class PrettyHelpFormatter(optparse.IndentedHelpFormatter):
-    """A prettier/less verbose help formatter for optparse."""
-
-    def __init__(self, *args, **kwargs):
-        # help position must be aligned with __init__.parseopts.description
-        kwargs['max_help_position'] = 30
-        kwargs['indent_increment'] = 1
-        kwargs['width'] = get_terminal_size()[0] - 2
-        optparse.IndentedHelpFormatter.__init__(self, *args, **kwargs)
-
-    def format_option_strings(self, option):
-        return self._format_option_strings(option, ' <%s>', ', ')
-
-    def _format_option_strings(self, option, mvarfmt=' <%s>', optsep=', '):
-        """
-        Return a comma-separated list of option strings and metavars.
-
-        :param option:  tuple of (short opt, long opt), e.g: ('-f', '--format')
-        :param mvarfmt: metavar format string - evaluated as mvarfmt % metavar
-        :param optsep:  separator
-        """
-        opts = []
-
-        if option._short_opts:
-            opts.append(option._short_opts[0])
-        if option._long_opts:
-            opts.append(option._long_opts[0])
-        if len(opts) > 1:
-            opts.insert(1, optsep)
-
-        if option.takes_value():
-            metavar = option.metavar or option.dest.lower()
-            opts.append(mvarfmt % metavar.lower())
-
-        return ''.join(opts)
-
-    def format_heading(self, heading):
-        if heading == 'Options':
-            return ''
-        return heading + ':\n'
-
-    def format_usage(self, usage):
-        """
-        Ensure there is only one newline between usage and the first heading
-        if there is no description.
-        """
-        msg = '\nUsage: %s\n' % self.indent_lines(textwrap.dedent(usage), "  ")
-        return msg
-
-    def format_description(self, description):
-        # leave full control over description to us
-        if description:
-            if hasattr(self.parser, 'main'):
-                label = 'Commands'
-            else:
-                label = 'Description'
-            # some doc strings have initial newlines, some don't
-            description = description.lstrip('\n')
-            # some doc strings have final newlines and spaces, some don't
-            description = description.rstrip()
-            # dedent, then reindent
-            description = self.indent_lines(textwrap.dedent(description), "  ")
-            description = '%s:\n%s\n' % (label, description)
-            return description
-        else:
-            return ''
-
-    def format_epilog(self, epilog):
-        # leave full control over epilog to us
-        if epilog:
-            return epilog
-        else:
-            return ''
-
-    def indent_lines(self, text, indent):
-        new_lines = [indent + line for line in text.split('\n')]
-        return "\n".join(new_lines)
-
-
-class UpdatingDefaultsHelpFormatter(PrettyHelpFormatter):
-    """Custom help formatter for use in ConfigOptionParser.
-
-    This is updates the defaults before expanding them, allowing
-    them to show up correctly in the help listing.
-    """
-
-    def expand_default(self, option):
-        if self.parser is not None:
-            self.parser._update_defaults(self.parser.defaults)
-        return optparse.IndentedHelpFormatter.expand_default(self, option)
-
-
-class CustomOptionParser(optparse.OptionParser):
-
-    def insert_option_group(self, idx, *args, **kwargs):
-        """Insert an OptionGroup at a given position."""
-        group = self.add_option_group(*args, **kwargs)
-
-        self.option_groups.pop()
-        self.option_groups.insert(idx, group)
-
-        return group
-
-    @property
-    def option_list_all(self):
-        """Get a list of all options, including those in option groups."""
-        res = self.option_list[:]
-        for i in self.option_groups:
-            res.extend(i.option_list)
-
-        return res
-
-
-class ConfigOptionParser(CustomOptionParser):
-    """Custom option parser which updates its defaults by checking the
-    configuration files and environmental variables"""
-
-    def __init__(self, *args, **kwargs):
-        self.name = kwargs.pop('name')
-
-        isolated = kwargs.pop("isolated", False)
-        self.config = Configuration(isolated)
-
-        assert self.name
-        optparse.OptionParser.__init__(self, *args, **kwargs)
-
-    def check_default(self, option, key, val):
-        try:
-            return option.check_value(key, val)
-        except optparse.OptionValueError as exc:
-            print("An error occurred during configuration: %s" % exc)
-            sys.exit(3)
-
-    def _get_ordered_configuration_items(self):
-        # Configuration gives keys in an unordered manner. Order them.
-        override_order = ["global", self.name, ":env:"]
-
-        # Pool the options into different groups
-        section_items = {name: [] for name in override_order}
-        for section_key, val in self.config.items():
-            # ignore empty values
-            if not val:
-                logger.debug(
-                    "Ignoring configuration key '%s' as it's value is empty.",
-                    section_key
-                )
-                continue
-
-            section, key = section_key.split(".", 1)
-            if section in override_order:
-                section_items[section].append((key, val))
-
-        # Yield each group in their override order
-        for section in override_order:
-            for key, val in section_items[section]:
-                yield key, val
-
-    def _update_defaults(self, defaults):
-        """Updates the given defaults with values from the config files and
-        the environ. Does a little special handling for certain types of
-        options (lists)."""
-
-        # Accumulate complex default state.
-        self.values = optparse.Values(self.defaults)
-        late_eval = set()
-        # Then set the options with those values
-        for key, val in self._get_ordered_configuration_items():
-            # '--' because configuration supports only long names
-            option = self.get_option('--' + key)
-
-            # Ignore options not present in this parser. E.g. non-globals put
-            # in [global] by users that want them to apply to all applicable
-            # commands.
-            if option is None:
-                continue
-
-            if option.action in ('store_true', 'store_false', 'count'):
-                try:
-                    val = strtobool(val)
-                except ValueError:
-                    error_msg = invalid_config_error_message(
-                        option.action, key, val
-                    )
-                    self.error(error_msg)
-
-            elif option.action == 'append':
-                val = val.split()
-                val = [self.check_default(option, key, v) for v in val]
-            elif option.action == 'callback':
-                late_eval.add(option.dest)
-                opt_str = option.get_opt_string()
-                val = option.convert_value(opt_str, val)
-                # From take_action
-                args = option.callback_args or ()
-                kwargs = option.callback_kwargs or {}
-                option.callback(option, opt_str, val, self, *args, **kwargs)
-            else:
-                val = self.check_default(option, key, val)
-
-            defaults[option.dest] = val
-
-        for key in late_eval:
-            defaults[key] = getattr(self.values, key)
-        self.values = None
-        return defaults
-
-    def get_default_values(self):
-        """Overriding to make updating the defaults after instantiation of
-        the option parser possible, _update_defaults() does the dirty work."""
-        if not self.process_default_values:
-            # Old, pre-Optik 1.5 behaviour.
-            return optparse.Values(self.defaults)
-
-        # Load the configuration, or error out in case of an error
-        try:
-            self.config.load()
-        except ConfigurationError as err:
-            self.exit(UNKNOWN_ERROR, str(err))
-
-        defaults = self._update_defaults(self.defaults.copy())  # ours
-        for option in self._get_all_options():
-            default = defaults.get(option.dest)
-            if isinstance(default, string_types):
-                opt_str = option.get_opt_string()
-                defaults[option.dest] = option.check_value(opt_str, default)
-        return optparse.Values(defaults)
-
-    def error(self, msg):
-        self.print_usage(sys.stderr)
-        self.exit(UNKNOWN_ERROR, "%s\n" % msg)
-
-
-def invalid_config_error_message(action, key, val):
-    """Returns a better error message when invalid configuration option
-    is provided."""
-    if action in ('store_true', 'store_false'):
-        return ("{0} is not a valid value for {1} option, "
-                "please specify a boolean value like yes/no, "
-                "true/false or 1/0 instead.").format(val, key)
-
-    return ("{0} is not a valid value for {1} option, "
-            "please specify a numerical value like 1/0 "
-            "instead.").format(val, key)

-"""Contains the Command base classes that depend on PipSession.
-
-The classes in this module are in a separate module so the commands not
-needing download / PackageFinder capability don't unnecessarily import the
-PackageFinder machinery and all its vendored dependencies, etc.
-"""
-
-import logging
-import os
-from functools import partial
-
-from pip._internal.cli.base_command import Command
-from pip._internal.cli.command_context import CommandContextMixIn
-from pip._internal.exceptions import CommandError
-from pip._internal.index.package_finder import PackageFinder
-from pip._internal.legacy_resolve import Resolver
-from pip._internal.models.selection_prefs import SelectionPreferences
-from pip._internal.network.download import Downloader
-from pip._internal.network.session import PipSession
-from pip._internal.operations.prepare import RequirementPreparer
-from pip._internal.req.constructors import (
-    install_req_from_editable,
-    install_req_from_line,
-    install_req_from_req_string,
-)
-from pip._internal.req.req_file import parse_requirements
-from pip._internal.self_outdated_check import (
-    make_link_collector,
-    pip_self_version_check,
-)
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from optparse import Values
-    from typing import List, Optional, Tuple
-    from pip._internal.cache import WheelCache
-    from pip._internal.models.target_python import TargetPython
-    from pip._internal.req.req_set import RequirementSet
-    from pip._internal.req.req_tracker import RequirementTracker
-    from pip._internal.utils.temp_dir import TempDirectory
-
-logger = logging.getLogger(__name__)
-
-
-class SessionCommandMixin(CommandContextMixIn):
-
-    """
-    A class mixin for command classes needing _build_session().
-    """
-    def __init__(self):
-        # type: () -> None
-        super(SessionCommandMixin, self).__init__()
-        self._session = None  # Optional[PipSession]
-
-    @classmethod
-    def _get_index_urls(cls, options):
-        # type: (Values) -> Optional[List[str]]
-        """Return a list of index urls from user-provided options."""
-        index_urls = []
-        if not getattr(options, "no_index", False):
-            url = getattr(options, "index_url", None)
-            if url:
-                index_urls.append(url)
-        urls = getattr(options, "extra_index_urls", None)
-        if urls:
-            index_urls.extend(urls)
-        # Return None rather than an empty list
-        return index_urls or None
-
-    def get_default_session(self, options):
-        # type: (Values) -> PipSession
-        """Get a default-managed session."""
-        if self._session is None:
-            self._session = self.enter_context(self._build_session(options))
-            # there's no type annotation on requests.Session, so it's
-            # automatically ContextManager[Any] and self._session becomes Any,
-            # then https://github.com/python/mypy/issues/7696 kicks in
-            assert self._session is not None
-        return self._session
-
-    def _build_session(self, options, retries=None, timeout=None):
-        # type: (Values, Optional[int], Optional[int]) -> PipSession
-        assert not options.cache_dir or os.path.isabs(options.cache_dir)
-        session = PipSession(
-            cache=(
-                os.path.join(options.cache_dir, "http")
-                if options.cache_dir else None
-            ),
-            retries=retries if retries is not None else options.retries,
-            trusted_hosts=options.trusted_hosts,
-            index_urls=self._get_index_urls(options),
-        )
-
-        # Handle custom ca-bundles from the user
-        if options.cert:
-            session.verify = options.cert
-
-        # Handle SSL client certificate
-        if options.client_cert:
-            session.cert = options.client_cert
-
-        # Handle timeouts
-        if options.timeout or timeout:
-            session.timeout = (
-                timeout if timeout is not None else options.timeout
-            )
-
-        # Handle configured proxies
-        if options.proxy:
-            session.proxies = {
-                "http": options.proxy,
-                "https": options.proxy,
-            }
-
-        # Determine if we can prompt the user for authentication or not
-        session.auth.prompting = not options.no_input
-
-        return session
-
-
-class IndexGroupCommand(Command, SessionCommandMixin):
-
-    """
-    Abstract base class for commands with the index_group options.
-
-    This also corresponds to the commands that permit the pip version check.
-    """
-
-    def handle_pip_version_check(self, options):
-        # type: (Values) -> None
-        """
-        Do the pip version check if not disabled.
-
-        This overrides the default behavior of not doing the check.
-        """
-        # Make sure the index_group options are present.
-        assert hasattr(options, 'no_index')
-
-        if options.disable_pip_version_check or options.no_index:
-            return
-
-        # Otherwise, check if we're using the latest version of pip available.
-        session = self._build_session(
-            options,
-            retries=0,
-            timeout=min(5, options.timeout)
-        )
-        with session:
-            pip_self_version_check(session, options)
-
-
-class RequirementCommand(IndexGroupCommand):
-
-    @staticmethod
-    def make_requirement_preparer(
-        temp_build_dir,           # type: TempDirectory
-        options,                  # type: Values
-        req_tracker,              # type: RequirementTracker
-        session,                  # type: PipSession
-        finder,                   # type: PackageFinder
-        use_user_site,            # type: bool
-        download_dir=None,        # type: str
-        wheel_download_dir=None,  # type: str
-    ):
-        # type: (...) -> RequirementPreparer
-        """
-        Create a RequirementPreparer instance for the given parameters.
-        """
-        downloader = Downloader(session, progress_bar=options.progress_bar)
-
-        temp_build_dir_path = temp_build_dir.path
-        assert temp_build_dir_path is not None
-
-        return RequirementPreparer(
-            build_dir=temp_build_dir_path,
-            src_dir=options.src_dir,
-            download_dir=download_dir,
-            wheel_download_dir=wheel_download_dir,
-            build_isolation=options.build_isolation,
-            req_tracker=req_tracker,
-            downloader=downloader,
-            finder=finder,
-            require_hashes=options.require_hashes,
-            use_user_site=use_user_site,
-        )
-
-    @staticmethod
-    def make_resolver(
-        preparer,                            # type: RequirementPreparer
-        finder,                              # type: PackageFinder
-        options,                             # type: Values
-        wheel_cache=None,                    # type: Optional[WheelCache]
-        use_user_site=False,                 # type: bool
-        ignore_installed=True,               # type: bool
-        ignore_requires_python=False,        # type: bool
-        force_reinstall=False,               # type: bool
-        upgrade_strategy="to-satisfy-only",  # type: str
-        use_pep517=None,                     # type: Optional[bool]
-        py_version_info=None            # type: Optional[Tuple[int, ...]]
-    ):
-        # type: (...) -> Resolver
-        """
-        Create a Resolver instance for the given parameters.
-        """
-        make_install_req = partial(
-            install_req_from_req_string,
-            isolated=options.isolated_mode,
-            wheel_cache=wheel_cache,
-            use_pep517=use_pep517,
-        )
-        return Resolver(
-            preparer=preparer,
-            finder=finder,
-            make_install_req=make_install_req,
-            use_user_site=use_user_site,
-            ignore_dependencies=options.ignore_dependencies,
-            ignore_installed=ignore_installed,
-            ignore_requires_python=ignore_requires_python,
-            force_reinstall=force_reinstall,
-            upgrade_strategy=upgrade_strategy,
-            py_version_info=py_version_info,
-        )
-
-    def populate_requirement_set(
-        self,
-        requirement_set,  # type: RequirementSet
-        args,             # type: List[str]
-        options,          # type: Values
-        finder,           # type: PackageFinder
-        session,          # type: PipSession
-        wheel_cache,      # type: Optional[WheelCache]
-    ):
-        # type: (...) -> None
-        """
-        Marshal cmd line args into a requirement set.
-        """
-        for filename in options.constraints:
-            for req_to_add in parse_requirements(
-                    filename,
-                    constraint=True, finder=finder, options=options,
-                    session=session, wheel_cache=wheel_cache):
-                req_to_add.is_direct = True
-                requirement_set.add_requirement(req_to_add)
-
-        for req in args:
-            req_to_add = install_req_from_line(
-                req, None, isolated=options.isolated_mode,
-                use_pep517=options.use_pep517,
-                wheel_cache=wheel_cache
-            )
-            req_to_add.is_direct = True
-            requirement_set.add_requirement(req_to_add)
-
-        for req in options.editables:
-            req_to_add = install_req_from_editable(
-                req,
-                isolated=options.isolated_mode,
-                use_pep517=options.use_pep517,
-                wheel_cache=wheel_cache
-            )
-            req_to_add.is_direct = True
-            requirement_set.add_requirement(req_to_add)
-
-        # NOTE: options.require_hashes may be set if --require-hashes is True
-        for filename in options.requirements:
-            for req_to_add in parse_requirements(
-                    filename,
-                    finder=finder, options=options, session=session,
-                    wheel_cache=wheel_cache,
-                    use_pep517=options.use_pep517):
-                req_to_add.is_direct = True
-                requirement_set.add_requirement(req_to_add)
-
-        # If any requirement has hash options, enable hash checking.
-        requirements = (
-            requirement_set.unnamed_requirements +
-            list(requirement_set.requirements.values())
-        )
-        if any(req.has_hash_options for req in requirements):
-            options.require_hashes = True
-
-        if not (args or options.editables or options.requirements):
-            opts = {'name': self.name}
-            if options.find_links:
-                raise CommandError(
-                    'You must give at least one requirement to %(name)s '
-                    '(maybe you meant "pip %(name)s %(links)s"?)' %
-                    dict(opts, links=' '.join(options.find_links)))
-            else:
-                raise CommandError(
-                    'You must give at least one requirement to %(name)s '
-                    '(see "pip help %(name)s")' % opts)
-
-    @staticmethod
-    def trace_basic_info(finder):
-        # type: (PackageFinder) -> None
-        """
-        Trace basic information about the provided objects.
-        """
-        # Display where finder is looking for packages
-        search_scope = finder.search_scope
-        locations = search_scope.get_formatted_locations()
-        if locations:
-            logger.info(locations)
-
-    def _build_package_finder(
-        self,
-        options,               # type: Values
-        session,               # type: PipSession
-        target_python=None,    # type: Optional[TargetPython]
-        ignore_requires_python=None,  # type: Optional[bool]
-    ):
-        # type: (...) -> PackageFinder
-        """
-        Create a package finder appropriate to this requirement command.
-
-        :param ignore_requires_python: Whether to ignore incompatible
-            "Requires-Python" values in links. Defaults to False.
-        """
-        link_collector = make_link_collector(session, options=options)
-        selection_prefs = SelectionPreferences(
-            allow_yanked=True,
-            format_control=options.format_control,
-            allow_all_prereleases=options.pre,
-            prefer_binary=options.prefer_binary,
-            ignore_requires_python=ignore_requires_python,
-        )
-
-        return PackageFinder.create(
-            link_collector=link_collector,
-            selection_prefs=selection_prefs,
-            target_python=target_python,
-        )

-from __future__ import absolute_import
-
-SUCCESS = 0
-ERROR = 1
-UNKNOWN_ERROR = 2
-VIRTUALENV_NOT_FOUND = 3
-PREVIOUS_BUILD_DIR_ERROR = 4
-NO_MATCHES_FOUND = 23

-"""
-Package containing all pip commands
-"""
-
-# The following comment should be removed at some point in the future.
-# mypy: disallow-untyped-defs=False
-
-from __future__ import absolute_import
-
-import importlib
-from collections import OrderedDict, namedtuple
-
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from typing import Any
-    from pip._internal.cli.base_command import Command
-
-
-CommandInfo = namedtuple('CommandInfo', 'module_path, class_name, summary')
-
-# The ordering matters for help display.
-#    Also, even though the module path starts with the same
-# "pip._internal.commands" prefix in each case, we include the full path
-# because it makes testing easier (specifically when modifying commands_dict
-# in test setup / teardown by adding info for a FakeCommand class defined
-# in a test-related module).
-#    Finally, we need to pass an iterable of pairs here rather than a dict
-# so that the ordering won't be lost when using Python 2.7.
-commands_dict = OrderedDict([
-    ('install', CommandInfo(
-        'pip._internal.commands.install', 'InstallCommand',
-        'Install packages.',
-    )),
-    ('download', CommandInfo(
-        'pip._internal.commands.download', 'DownloadCommand',
-        'Download packages.',
-    )),
-    ('uninstall', CommandInfo(
-        'pip._internal.commands.uninstall', 'UninstallCommand',
-        'Uninstall packages.',
-    )),
-    ('freeze', CommandInfo(
-        'pip._internal.commands.freeze', 'FreezeCommand',
-        'Output installed packages in requirements format.',
-    )),
-    ('list', CommandInfo(
-        'pip._internal.commands.list', 'ListCommand',
-        'List installed packages.',
-    )),
-    ('show', CommandInfo(
-        'pip._internal.commands.show', 'ShowCommand',
-        'Show information about installed packages.',
-    )),
-    ('check', CommandInfo(
-        'pip._internal.commands.check', 'CheckCommand',
-        'Verify installed packages have compatible dependencies.',
-    )),
-    ('config', CommandInfo(
-        'pip._internal.commands.configuration', 'ConfigurationCommand',
-        'Manage local and global configuration.',
-    )),
-    ('search', CommandInfo(
-        'pip._internal.commands.search', 'SearchCommand',
-        'Search PyPI for packages.',
-    )),
-    ('wheel', CommandInfo(
-        'pip._internal.commands.wheel', 'WheelCommand',
-        'Build wheels from your requirements.',
-    )),
-    ('hash', CommandInfo(
-        'pip._internal.commands.hash', 'HashCommand',
-        'Compute hashes of package archives.',
-    )),
-    ('completion', CommandInfo(
-        'pip._internal.commands.completion', 'CompletionCommand',
-        'A helper command used for command completion.',
-    )),
-    ('debug', CommandInfo(
-        'pip._internal.commands.debug', 'DebugCommand',
-        'Show information useful for debugging.',
-    )),
-    ('help', CommandInfo(
-        'pip._internal.commands.help', 'HelpCommand',
-        'Show help for commands.',
-    )),
-])  # type: OrderedDict[str, CommandInfo]
-
-
-def create_command(name, **kwargs):
-    # type: (str, **Any) -> Command
-    """
-    Create an instance of the Command class with the given name.
-    """
-    module_path, class_name, summary = commands_dict[name]
-    module = importlib.import_module(module_path)
-    command_class = getattr(module, class_name)
-    command = command_class(name=name, summary=summary, **kwargs)
-
-    return command
-
-
-def get_similar_commands(name):
-    """Command name auto-correct."""
-    from difflib import get_close_matches
-
-    name = name.lower()
-
-    close_commands = get_close_matches(name, commands_dict.keys())
-
-    if close_commands:
-        return close_commands[0]
-    else:
-        return False

-# The following comment should be removed at some point in the future.
-# mypy: disallow-untyped-defs=False
-
-import logging
-
-from pip._internal.cli.base_command import Command
-from pip._internal.operations.check import (
-    check_package_set,
-    create_package_set_from_installed,
-)
-from pip._internal.utils.misc import write_output
-
-logger = logging.getLogger(__name__)
-
-
-class CheckCommand(Command):
-    """Verify installed packages have compatible dependencies."""
-
-    usage = """
-      %prog [options]"""
-
-    def run(self, options, args):
-        package_set, parsing_probs = create_package_set_from_installed()
-        missing, conflicting = check_package_set(package_set)
-
-        for project_name in missing:
-            version = package_set[project_name].version
-            for dependency in missing[project_name]:
-                write_output(
-                    "%s %s requires %s, which is not installed.",
-                    project_name, version, dependency[0],
-                )
-
-        for project_name in conflicting:
-            version = package_set[project_name].version
-            for dep_name, dep_version, req in conflicting[project_name]:
-                write_output(
-                    "%s %s has requirement %s, but you have %s %s.",
-                    project_name, version, req, dep_name, dep_version,
-                )
-
-        if missing or conflicting or parsing_probs:
-            return 1
-        else:
-            write_output("No broken requirements found.")

-# The following comment should be removed at some point in the future.
-# mypy: disallow-untyped-defs=False
-
-from __future__ import absolute_import
-
-import sys
-import textwrap
-
-from pip._internal.cli.base_command import Command
-from pip._internal.utils.misc import get_prog
-
-BASE_COMPLETION = """
-# pip %(shell)s completion start%(script)s# pip %(shell)s completion end
-"""
-
-COMPLETION_SCRIPTS = {
-    'bash': """
-        _pip_completion()
-        {
-            COMPREPLY=( $( COMP_WORDS="${COMP_WORDS[*]}" \\
-                           COMP_CWORD=$COMP_CWORD \\
-                           PIP_AUTO_COMPLETE=1 $1 2>/dev/null ) )
-        }
-        complete -o default -F _pip_completion %(prog)s
-    """,
-    'zsh': """
-        function _pip_completion {
-          local words cword
-          read -Ac words
-          read -cn cword
-          reply=( $( COMP_WORDS="$words[*]" \\
-                     COMP_CWORD=$(( cword-1 )) \\
-                     PIP_AUTO_COMPLETE=1 $words[1] 2>/dev/null ))
-        }
-        compctl -K _pip_completion %(prog)s
-    """,
-    'fish': """
-        function __fish_complete_pip
-            set -lx COMP_WORDS (commandline -o) ""
-            set -lx COMP_CWORD ( \\
-                math (contains -i -- (commandline -t) $COMP_WORDS)-1 \\
-            )
-            set -lx PIP_AUTO_COMPLETE 1
-            string split \\  -- (eval $COMP_WORDS[1])
-        end
-        complete -fa "(__fish_complete_pip)" -c %(prog)s
-    """,
-}
-
-
-class CompletionCommand(Command):
-    """A helper command to be used for command completion."""
-
-    ignore_require_venv = True
-
-    def __init__(self, *args, **kw):
-        super(CompletionCommand, self).__init__(*args, **kw)
-
-        cmd_opts = self.cmd_opts
-
-        cmd_opts.add_option(
-            '--bash', '-b',
-            action='store_const',
-            const='bash',
-            dest='shell',
-            help='Emit completion code for bash')
-        cmd_opts.add_option(
-            '--zsh', '-z',
-            action='store_const',
-            const='zsh',
-            dest='shell',
-            help='Emit completion code for zsh')
-        cmd_opts.add_option(
-            '--fish', '-f',
-            action='store_const',
-            const='fish',
-            dest='shell',
-            help='Emit completion code for fish')
-
-        self.parser.insert_option_group(0, cmd_opts)
-
-    def run(self, options, args):
-        """Prints the completion code of the given shell"""
-        shells = COMPLETION_SCRIPTS.keys()
-        shell_options = ['--' + shell for shell in sorted(shells)]
-        if options.shell in shells:
-            script = textwrap.dedent(
-                COMPLETION_SCRIPTS.get(options.shell, '') % {
-                    'prog': get_prog(),
-                }
-            )
-            print(BASE_COMPLETION % {'script': script, 'shell': options.shell})
-        else:
-            sys.stderr.write(
-                'ERROR: You must pass %s\n' % ' or '.join(shell_options)
-            )

-# The following comment should be removed at some point in the future.
-# mypy: disallow-untyped-defs=False
-
-import logging
-import os
-import subprocess
-
-from pip._internal.cli.base_command import Command
-from pip._internal.cli.status_codes import ERROR, SUCCESS
-from pip._internal.configuration import (
-    Configuration,
-    get_configuration_files,
-    kinds,
-)
-from pip._internal.exceptions import PipError
-from pip._internal.utils.misc import get_prog, write_output
-
-logger = logging.getLogger(__name__)
-
-
-class ConfigurationCommand(Command):
-    """Manage local and global configuration.
-
-        Subcommands:
-
-        list: List the active configuration (or from the file specified)
-        edit: Edit the configuration file in an editor
-        get: Get the value associated with name
-        set: Set the name=value
-        unset: Unset the value associated with name
-
-        If none of --user, --global and --site are passed, a virtual
-        environment configuration file is used if one is active and the file
-        exists. Otherwise, all modifications happen on the to the user file by
-        default.
-    """
-
-    ignore_require_venv = True
-    usage = """
-        %prog [<file-option>] list
-        %prog [<file-option>] [--editor <editor-path>] edit
-
-        %prog [<file-option>] get name
-        %prog [<file-option>] set name value
-        %prog [<file-option>] unset name
-    """
-
-    def __init__(self, *args, **kwargs):
-        super(ConfigurationCommand, self).__init__(*args, **kwargs)
-
-        self.configuration = None
-
-        self.cmd_opts.add_option(
-            '--editor',
-            dest='editor',
-            action='store',
-            default=None,
-            help=(
-                'Editor to use to edit the file. Uses VISUAL or EDITOR '
-                'environment variables if not provided.'
-            )
-        )
-
-        self.cmd_opts.add_option(
-            '--global',
-            dest='global_file',
-            action='store_true',
-            default=False,
-            help='Use the system-wide configuration file only'
-        )
-
-        self.cmd_opts.add_option(
-            '--user',
-            dest='user_file',
-            action='store_true',
-            default=False,
-            help='Use the user configuration file only'
-        )
-
-        self.cmd_opts.add_option(
-            '--site',
-            dest='site_file',
-            action='store_true',
-            default=False,
-            help='Use the current environment configuration file only'
-        )
-
-        self.parser.insert_option_group(0, self.cmd_opts)
-
-    def run(self, options, args):
-        handlers = {
-            "list": self.list_values,
-            "edit": self.open_in_editor,
-            "get": self.get_name,
-            "set": self.set_name_value,
-            "unset": self.unset_name
-        }
-
-        # Determine action
-        if not args or args[0] not in handlers:
-            logger.error("Need an action ({}) to perform.".format(
-                ", ".join(sorted(handlers)))
-            )
-            return ERROR
-
-        action = args[0]
-
-        # Determine which configuration files are to be loaded
-        #    Depends on whether the command is modifying.
-        try:
-            load_only = self._determine_file(
-                options, need_value=(action in ["get", "set", "unset", "edit"])
-            )
-        except PipError as e:
-            logger.error(e.args[0])
-            return ERROR
-
-        # Load a new configuration
-        self.configuration = Configuration(
-            isolated=options.isolated_mode, load_only=load_only
-        )
-        self.configuration.load()
-
-        # Error handling happens here, not in the action-handlers.
-        try:
-            handlers[action](options, args[1:])
-        except PipError as e:
-            logger.error(e.args[0])
-            return ERROR
-
-        return SUCCESS
-
-    def _determine_file(self, options, need_value):
-        file_options = [key for key, value in (
-            (kinds.USER, options.user_file),
-            (kinds.GLOBAL, options.global_file),
-            (kinds.SITE, options.site_file),
-        ) if value]
-
-        if not file_options:
-            if not need_value:
-                return None
-            # Default to user, unless there's a site file.
-            elif any(
-                os.path.exists(site_config_file)
-                for site_config_file in get_configuration_files()[kinds.SITE]
-            ):
-                return kinds.SITE
-            else:
-                return kinds.USER
-        elif len(file_options) == 1:
-            return file_options[0]
-
-        raise PipError(
-            "Need exactly one file to operate upon "
-            "(--user, --site, --global) to perform."
-        )
-
-    def list_values(self, options, args):
-        self._get_n_args(args, "list", n=0)
-
-        for key, value in sorted(self.configuration.items()):
-            write_output("%s=%r", key, value)
-
-    def get_name(self, options, args):
-        key = self._get_n_args(args, "get [name]", n=1)
-        value = self.configuration.get_value(key)
-
-        write_output("%s", value)
-
-    def set_name_value(self, options, args):
-        key, value = self._get_n_args(args, "set [name] [value]", n=2)
-        self.configuration.set_value(key, value)
-
-        self._save_configuration()
-
-    def unset_name(self, options, args):
-        key = self._get_n_args(args, "unset [name]", n=1)
-        self.configuration.unset_value(key)
-
-        self._save_configuration()
-
-    def open_in_editor(self, options, args):
-        editor = self._determine_editor(options)
-
-        fname = self.configuration.get_file_to_edit()
-        if fname is None:
-            raise PipError("Could not determine appropriate file.")
-
-        try:
-            subprocess.check_call([editor, fname])
-        except subprocess.CalledProcessError as e:
-            raise PipError(
-                "Editor Subprocess exited with exit code {}"
-                .format(e.returncode)
-            )
-
-    def _get_n_args(self, args, example, n):
-        """Helper to make sure the command got the right number of arguments
-        """
-        if len(args) != n:
-            msg = (
-                'Got unexpected number of arguments, expected {}. '
-                '(example: "{} config {}")'
-            ).format(n, get_prog(), example)
-            raise PipError(msg)
-
-        if n == 1:
-            return args[0]
-        else:
-            return args
-
-    def _save_configuration(self):
-        # We successfully ran a modifying command. Need to save the
-        # configuration.
-        try:
-            self.configuration.save()
-        except Exception:
-            logger.error(
-                "Unable to save configuration. Please report this as a bug.",
-                exc_info=1
-            )
-            raise PipError("Internal Error.")
-
-    def _determine_editor(self, options):
-        if options.editor is not None:
-            return options.editor
-        elif "VISUAL" in os.environ:
-            return os.environ["VISUAL"]
-        elif "EDITOR" in os.environ:
-            return os.environ["EDITOR"]
-        else:
-            raise PipError("Could not determine editor to use.")

-# The following comment should be removed at some point in the future.
-# mypy: disallow-untyped-defs=False
-
-from __future__ import absolute_import
-
-import locale
-import logging
-import os
-import sys
-
-from pip._vendor.certifi import where
-
-from pip._internal.cli import cmdoptions
-from pip._internal.cli.base_command import Command
-from pip._internal.cli.cmdoptions import make_target_python
-from pip._internal.cli.status_codes import SUCCESS
-from pip._internal.utils.logging import indent_log
-from pip._internal.utils.misc import get_pip_version
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from typing import Any, List, Optional
-    from optparse import Values
-
-logger = logging.getLogger(__name__)
-
-
-def show_value(name, value):
-    # type: (str, Optional[str]) -> None
-    logger.info('{}: {}'.format(name, value))
-
-
-def show_sys_implementation():
-    # type: () -> None
-    logger.info('sys.implementation:')
-    if hasattr(sys, 'implementation'):
-        implementation = sys.implementation  # type: ignore
-        implementation_name = implementation.name
-    else:
-        implementation_name = ''
-
-    with indent_log():
-        show_value('name', implementation_name)
-
-
-def show_tags(options):
-    # type: (Values) -> None
-    tag_limit = 10
-
-    target_python = make_target_python(options)
-    tags = target_python.get_tags()
-
-    # Display the target options that were explicitly provided.
-    formatted_target = target_python.format_given()
-    suffix = ''
-    if formatted_target:
-        suffix = ' (target: {})'.format(formatted_target)
-
-    msg = 'Compatible tags: {}{}'.format(len(tags), suffix)
-    logger.info(msg)
-
-    if options.verbose < 1 and len(tags) > tag_limit:
-        tags_limited = True
-        tags = tags[:tag_limit]
-    else:
-        tags_limited = False
-
-    with indent_log():
-        for tag in tags:
-            logger.info(str(tag))
-
-        if tags_limited:
-            msg = (
-                '...\n'
-                '[First {tag_limit} tags shown. Pass --verbose to show all.]'
-            ).format(tag_limit=tag_limit)
-            logger.info(msg)
-
-
-def ca_bundle_info(config):
-    levels = set()
-    for key, value in config.items():
-        levels.add(key.split('.')[0])
-
-    if not levels:
-        return "Not specified"
-
-    levels_that_override_global = ['install', 'wheel', 'download']
-    global_overriding_level = [
-        level for level in levels if level in levels_that_override_global
-    ]
-    if not global_overriding_level:
-        return 'global'
-
-    levels.remove('global')
-    return ", ".join(levels)
-
-
-class DebugCommand(Command):
-    """
-    Display debug information.
-    """
-
-    usage = """
-      %prog <options>"""
-    ignore_require_venv = True
-
-    def __init__(self, *args, **kw):
-        super(DebugCommand, self).__init__(*args, **kw)
-
-        cmd_opts = self.cmd_opts
-        cmdoptions.add_target_python_options(cmd_opts)
-        self.parser.insert_option_group(0, cmd_opts)
-        self.parser.config.load()
-
-    def run(self, options, args):
-        # type: (Values, List[Any]) -> int
-        logger.warning(
-            "This command is only meant for debugging. "
-            "Do not use this with automation for parsing and getting these "
-            "details, since the output and options of this command may "
-            "change without notice."
-        )
-        show_value('pip version', get_pip_version())
-        show_value('sys.version', sys.version)
-        show_value('sys.executable', sys.executable)
-        show_value('sys.getdefaultencoding', sys.getdefaultencoding())
-        show_value('sys.getfilesystemencoding', sys.getfilesystemencoding())
-        show_value(
-            'locale.getpreferredencoding', locale.getpreferredencoding(),
-        )
-        show_value('sys.platform', sys.platform)
-        show_sys_implementation()
-
-        show_value("'cert' config value", ca_bundle_info(self.parser.config))
-        show_value("REQUESTS_CA_BUNDLE", os.environ.get('REQUESTS_CA_BUNDLE'))
-        show_value("CURL_CA_BUNDLE", os.environ.get('CURL_CA_BUNDLE'))
-        show_value("pip._vendor.certifi.where()", where())
-
-        show_tags(options)
-
-        return SUCCESS

-# The following comment should be removed at some point in the future.
-# mypy: disallow-untyped-defs=False
-
-from __future__ import absolute_import
-
-import logging
-import os
-
-from pip._internal.cli import cmdoptions
-from pip._internal.cli.cmdoptions import make_target_python
-from pip._internal.cli.req_command import RequirementCommand
-from pip._internal.req import RequirementSet
-from pip._internal.req.req_tracker import get_requirement_tracker
-from pip._internal.utils.misc import ensure_dir, normalize_path, write_output
-from pip._internal.utils.temp_dir import TempDirectory
-
-logger = logging.getLogger(__name__)
-
-
-class DownloadCommand(RequirementCommand):
-    """
-    Download packages from:
-
-    - PyPI (and other indexes) using requirement specifiers.
-    - VCS project urls.
-    - Local project directories.
-    - Local or remote source archives.
-
-    pip also supports downloading from "requirements files", which provide
-    an easy way to specify a whole environment to be downloaded.
-    """
-
-    usage = """
-      %prog [options] <requirement specifier> [package-index-options] ...
-      %prog [options] -r <requirements file> [package-index-options] ...
-      %prog [options] <vcs project url> ...
-      %prog [options] <local project path> ...
-      %prog [options] <archive url/path> ..."""
-
-    def __init__(self, *args, **kw):
-        super(DownloadCommand, self).__init__(*args, **kw)
-
-        cmd_opts = self.cmd_opts
-
-        cmd_opts.add_option(cmdoptions.constraints())
-        cmd_opts.add_option(cmdoptions.requirements())
-        cmd_opts.add_option(cmdoptions.build_dir())
-        cmd_opts.add_option(cmdoptions.no_deps())
-        cmd_opts.add_option(cmdoptions.global_options())
-        cmd_opts.add_option(cmdoptions.no_binary())
-        cmd_opts.add_option(cmdoptions.only_binary())
-        cmd_opts.add_option(cmdoptions.prefer_binary())
-        cmd_opts.add_option(cmdoptions.src())
-        cmd_opts.add_option(cmdoptions.pre())
-        cmd_opts.add_option(cmdoptions.no_clean())
-        cmd_opts.add_option(cmdoptions.require_hashes())
-        cmd_opts.add_option(cmdoptions.progress_bar())
-        cmd_opts.add_option(cmdoptions.no_build_isolation())
-        cmd_opts.add_option(cmdoptions.use_pep517())
-        cmd_opts.add_option(cmdoptions.no_use_pep517())
-
-        cmd_opts.add_option(
-            '-d', '--dest', '--destination-dir', '--destination-directory',
-            dest='download_dir',
-            metavar='dir',
-            default=os.curdir,
-            help=("Download packages into <dir>."),
-        )
-
-        cmdoptions.add_target_python_options(cmd_opts)
-
-        index_opts = cmdoptions.make_option_group(
-            cmdoptions.index_group,
-            self.parser,
-        )
-
-        self.parser.insert_option_group(0, index_opts)
-        self.parser.insert_option_group(0, cmd_opts)
-
-    def run(self, options, args):
-        options.ignore_installed = True
-        # editable doesn't really make sense for `pip download`, but the bowels
-        # of the RequirementSet code require that property.
-        options.editables = []
-
-        cmdoptions.check_dist_restriction(options)
-
-        options.download_dir = normalize_path(options.download_dir)
-
-        ensure_dir(options.download_dir)
-
-        session = self.get_default_session(options)
-
-        target_python = make_target_python(options)
-        finder = self._build_package_finder(
-            options=options,
-            session=session,
-            target_python=target_python,
-        )
-        build_delete = (not (options.no_clean or options.build_dir))
-
-        with get_requirement_tracker() as req_tracker, TempDirectory(
-            options.build_dir, delete=build_delete, kind="download"
-        ) as directory:
-
-            requirement_set = RequirementSet()
-            self.populate_requirement_set(
-                requirement_set,
-                args,
-                options,
-                finder,
-                session,
-                None
-            )
-
-            preparer = self.make_requirement_preparer(
-                temp_build_dir=directory,
-                options=options,
-                req_tracker=req_tracker,
-                session=session,
-                finder=finder,
-                download_dir=options.download_dir,
-                use_user_site=False,
-            )
-
-            resolver = self.make_resolver(
-                preparer=preparer,
-                finder=finder,
-                options=options,
-                py_version_info=options.python_version,
-            )
-
-            self.trace_basic_info(finder)
-
-            resolver.resolve(requirement_set)
-
-            downloaded = ' '.join([
-                req.name for req in requirement_set.successfully_downloaded
-            ])
-            if downloaded:
-                write_output('Successfully downloaded %s', downloaded)
-
-            # Clean up
-            if not options.no_clean:
-                requirement_set.cleanup_files()
-
-        return requirement_set

-# The following comment should be removed at some point in the future.
-# mypy: disallow-untyped-defs=False
-
-from __future__ import absolute_import
-
-import sys
-
-from pip._internal.cache import WheelCache
-from pip._internal.cli import cmdoptions
-from pip._internal.cli.base_command import Command
-from pip._internal.models.format_control import FormatControl
-from pip._internal.operations.freeze import freeze
-from pip._internal.utils.compat import stdlib_pkgs
-
-DEV_PKGS = {'pip', 'setuptools', 'distribute', 'wheel', 'pkg-resources'}
-
-
-class FreezeCommand(Command):
-    """
-    Output installed packages in requirements format.
-
-    packages are listed in a case-insensitive sorted order.
-    """
-
-    usage = """
-      %prog [options]"""
-    log_streams = ("ext://sys.stderr", "ext://sys.stderr")
-
-    def __init__(self, *args, **kw):
-        super(FreezeCommand, self).__init__(*args, **kw)
-
-        self.cmd_opts.add_option(
-            '-r', '--requirement',
-            dest='requirements',
-            action='append',
-            default=[],
-            metavar='file',
-            help="Use the order in the given requirements file and its "
-                 "comments when generating output. This option can be "
-                 "used multiple times.")
-        self.cmd_opts.add_option(
-            '-f', '--find-links',
-            dest='find_links',
-            action='append',
-            default=[],
-            metavar='URL',
-            help='URL for finding packages, which will be added to the '
-                 'output.')
-        self.cmd_opts.add_option(
-            '-l', '--local',
-            dest='local',
-            action='store_true',
-            default=False,
-            help='If in a virtualenv that has global access, do not output '
-                 'globally-installed packages.')
-        self.cmd_opts.add_option(
-            '--user',
-            dest='user',
-            action='store_true',
-            default=False,
-            help='Only output packages installed in user-site.')
-        self.cmd_opts.add_option(cmdoptions.list_path())
-        self.cmd_opts.add_option(
-            '--all',
-            dest='freeze_all',
-            action='store_true',
-            help='Do not skip these packages in the output:'
-                 ' %s' % ', '.join(DEV_PKGS))
-        self.cmd_opts.add_option(
-            '--exclude-editable',
-            dest='exclude_editable',
-            action='store_true',
-            help='Exclude editable package from output.')
-
-        self.parser.insert_option_group(0, self.cmd_opts)
-
-    def run(self, options, args):
-        format_control = FormatControl(set(), set())
-        wheel_cache = WheelCache(options.cache_dir, format_control)
-        skip = set(stdlib_pkgs)
-        if not options.freeze_all:
-            skip.update(DEV_PKGS)
-
-        cmdoptions.check_list_path_option(options)
-
-        freeze_kwargs = dict(
-            requirement=options.requirements,
-            find_links=options.find_links,
-            local_only=options.local,
-            user_only=options.user,
-            paths=options.path,
-            skip_regex=options.skip_requirements_regex,
-            isolated=options.isolated_mode,
-            wheel_cache=wheel_cache,
-            skip=skip,
-            exclude_editable=options.exclude_editable,
-        )
-
-        try:
-            for line in freeze(**freeze_kwargs):
-                sys.stdout.write(line + '\n')
-        finally:
-            wheel_cache.cleanup()

-# The following comment should be removed at some point in the future.
-# mypy: disallow-untyped-defs=False
-
-from __future__ import absolute_import
-
-import hashlib
-import logging
-import sys
-
-from pip._internal.cli.base_command import Command
-from pip._internal.cli.status_codes import ERROR
-from pip._internal.utils.hashes import FAVORITE_HASH, STRONG_HASHES
-from pip._internal.utils.misc import read_chunks, write_output
-
-logger = logging.getLogger(__name__)
-
-
-class HashCommand(Command):
-    """
-    Compute a hash of a local package archive.
-
-    These can be used with --hash in a requirements file to do repeatable
-    installs.
-    """
-
-    usage = '%prog [options] <file> ...'
-    ignore_require_venv = True
-
-    def __init__(self, *args, **kw):
-        super(HashCommand, self).__init__(*args, **kw)
-        self.cmd_opts.add_option(
-            '-a', '--algorithm',
-            dest='algorithm',
-            choices=STRONG_HASHES,
-            action='store',
-            default=FAVORITE_HASH,
-            help='The hash algorithm to use: one of %s' %
-                 ', '.join(STRONG_HASHES))
-        self.parser.insert_option_group(0, self.cmd_opts)
-
-    def run(self, options, args):
-        if not args:
-            self.parser.print_usage(sys.stderr)
-            return ERROR
-
-        algorithm = options.algorithm
-        for path in args:
-            write_output('%s:\n--hash=%s:%s',
-                         path, algorithm, _hash_of_file(path, algorithm))
-
-
-def _hash_of_file(path, algorithm):
-    """Return the hash digest of a file."""
-    with open(path, 'rb') as archive:
-        hash = hashlib.new(algorithm)
-        for chunk in read_chunks(archive):
-            hash.update(chunk)
-    return hash.hexdigest()

-# The following comment should be removed at some point in the future.
-# mypy: disallow-untyped-defs=False
-
-from __future__ import absolute_import
-
-from pip._internal.cli.base_command import Command
-from pip._internal.cli.status_codes import SUCCESS
-from pip._internal.exceptions import CommandError
-
-
-class HelpCommand(Command):
-    """Show help for commands"""
-
-    usage = """
-      %prog <command>"""
-    ignore_require_venv = True
-
-    def run(self, options, args):
-        from pip._internal.commands import (
-            commands_dict, create_command, get_similar_commands,
-        )
-
-        try:
-            # 'pip help' with no args is handled by pip.__init__.parseopt()
-            cmd_name = args[0]  # the command we need help for
-        except IndexError:
-            return SUCCESS
-
-        if cmd_name not in commands_dict:
-            guess = get_similar_commands(cmd_name)
-
-            msg = ['unknown command "%s"' % cmd_name]
-            if guess:
-                msg.append('maybe you meant "%s"' % guess)
-
-            raise CommandError(' - '.join(msg))
-
-        command = create_command(cmd_name)
-        command.parser.print_help()
-
-        return SUCCESS