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Update pip to 22.3.1 #121

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This PR updates pip from 20.0.2 to 22.3.1.

Changelog

22.3.1

===================

Bug Fixes
---------

- Fix entry point generation of ``pip.X``, ``pipX.Y``, and ``easy_install-X.Y``
to correctly account for multi-digit Python version segments (e.g. the "11"
part of 3.11). (`11547 <https://github.com/pypa/pip/issues/11547>`_)

22.3

=================

Deprecations and Removals
-------------------------

- Deprecate ``--install-options`` which forces pip to use the deprecated ``install``
command of ``setuptools``. (`11358 <https://github.com/pypa/pip/issues/11358>`_)
- Deprecate installation with 'setup.py install' when no-binary is enabled for
source distributions without 'pyproject.toml'. (`11452 <https://github.com/pypa/pip/issues/11452>`_)
- Deprecate --no-binary`` disabling the wheel cache. (`11454 <https://github.com/pypa/pip/issues/11454>`_)
- Remove ``--use-feature=2020-resolver`` opt-in flag. This was supposed to be removed in 21.0, but missed during that release cycle. (`11493 <https://github.com/pypa/pip/issues/11493>`_)
- Deprecate installation with 'setup.py install' when the 'wheel' package is absent for
source distributions without 'pyproject.toml'. (`8559 <https://github.com/pypa/pip/issues/8559>`_)
- Remove the ability to use ``pip list --outdated`` in combination with ``--format=freeze``. (`9789 <https://github.com/pypa/pip/issues/9789>`_)

Features
--------

- Use ``shell=True`` for opening the editor with ``pip config edit``. (`10716 <https://github.com/pypa/pip/issues/10716>`_)
- Use the ``data-dist-info-metadata`` attribute from :pep:`658` to resolve distribution metadata without downloading the dist yet. (`11111 <https://github.com/pypa/pip/issues/11111>`_)
- Add an option to run the test suite with pip built as a zipapp. (`11250 <https://github.com/pypa/pip/issues/11250>`_)
- Add a ``--python`` option to allow pip to manage Python environments other
than the one pip is installed in. (`11320 <https://github.com/pypa/pip/issues/11320>`_)
- Document the new (experimental) zipapp distribution of pip. (`11459 <https://github.com/pypa/pip/issues/11459>`_)
- Use the much faster 'bzr co --lightweight' to obtain a copy of a Bazaar tree. (`5444 <https://github.com/pypa/pip/issues/5444>`_)

Bug Fixes
---------

- Fix ``--no-index`` when ``--index-url`` or ``--extra-index-url`` is specified
inside a requirements file. (`11276 <https://github.com/pypa/pip/issues/11276>`_)
- Ensure that the candidate ``pip`` executable exists, when checking for a new version of pip. (`11309 <https://github.com/pypa/pip/issues/11309>`_)
- Ignore distributions with invalid ``Name`` in metadata instead of crashing, when
using the ``importlib.metadata`` backend. (`11352 <https://github.com/pypa/pip/issues/11352>`_)
- Raise RequirementsFileParseError when parsing malformed requirements options that can't be sucessfully parsed by shlex. (`11491 <https://github.com/pypa/pip/issues/11491>`_)
- Fix build environment isolation on some system Pythons. (`6264 <https://github.com/pypa/pip/issues/6264>`_)

Vendored Libraries
------------------

- Upgrade certifi to 2022.9.24
- Upgrade distlib to 0.3.6
- Upgrade idna to 3.4
- Upgrade pep517 to 0.13.0
- Upgrade pygments to 2.13.0
- Upgrade tenacity to 8.1.0
- Upgrade typing_extensions to 4.4.0
- Upgrade urllib3 to 1.26.12

Improved Documentation
----------------------

- Mention that --quiet must be used when writing the installation report to stdout. (`11357 <https://github.com/pypa/pip/issues/11357>`_)

22.2.2

===================

Bug Fixes
---------

- Avoid  ``AttributeError`` when removing the setuptools-provided ``_distutils_hack`` and it is missing its implementation. (`11314 <https://github.com/pypa/pip/issues/11314>`_)
- Fix import error when reinstalling pip in user site. (`11319 <https://github.com/pypa/pip/issues/11319>`_)
- Show pip deprecation warnings by default. (`11330 <https://github.com/pypa/pip/issues/11330>`_)

22.2.1

===================

Bug Fixes
---------

- Send the pip upgrade prompt to stderr. (`11282 <https://github.com/pypa/pip/issues/11282>`_)
- Ensure that things work correctly in environments where setuptools-injected
``distutils`` is available by default. This is done by cooperating with
setuptools' injection logic to ensure that pip uses the ``distutils`` from the
Python standard library instead. (`11298 <https://github.com/pypa/pip/issues/11298>`_)
- Clarify that ``pip cache``'s wheels-related output is about locally built wheels only. (`11300 <https://github.com/pypa/pip/issues/11300>`_)

22.2

=================

Deprecations and Removals
-------------------------

- Remove the ``html5lib`` deprecated feature flag. (`10825 <https://github.com/pypa/pip/issues/10825>`_)
- Remove ``--use-deprecated=backtrack-on-build-failures``. (`11241 <https://github.com/pypa/pip/issues/11241>`_)

Features
--------

- Add support to use `truststore <https://pypi.org/project/truststore/>`_ as an
alternative SSL certificate verification backend. The backend can be enabled on Python
3.10 and later by installing ``truststore`` into the environment, and adding the
``--use-feature=truststore`` flag to various pip commands.

``truststore`` differs from the current default verification backend (provided by
``certifi``) in it uses the operating system’s trust store, which can be better
controlled and augmented to better support non-standard certificates. Depending on
feedback, pip may switch to this as the default certificate verification backend in
the future. (`11082 <https://github.com/pypa/pip/issues/11082>`_)
- Add ``--dry-run`` option to ``pip install``, to let it print what it would install but
not actually change anything in the target environment. (`11096 <https://github.com/pypa/pip/issues/11096>`_)
- Record in wheel cache entries the URL of the original artifact that was downloaded
to build the cached wheels. The record is named ``origin.json`` and uses the PEP 610
Direct URL format. (`11137 <https://github.com/pypa/pip/issues/11137>`_)
- Support `PEP 691 <https://peps.python.org/pep-0691/>`_. (`#11158 <https://github.com/pypa/pip/issues/11158>`_)
- pip's deprecation warnings now subclass the built-in ``DeprecationWarning``, and
can be suppressed by running the Python interpreter with
``-W ignore::DeprecationWarning``. (`11225 <https://github.com/pypa/pip/issues/11225>`_)
- Add ``pip inspect`` command to obtain the list of installed distributions and other
information about the Python environment, in JSON format. (`11245 <https://github.com/pypa/pip/issues/11245>`_)
- Significantly speed up isolated environment creation, by using the same
sources for pip instead of creating a standalone installation for each
environment. (`11257 <https://github.com/pypa/pip/issues/11257>`_)
- Add an experimental ``--report`` option to the install command to generate a JSON report
of what was installed. In combination with ``--dry-run`` and ``--ignore-installed`` it
can be used to resolve the requirements. (`53 <https://github.com/pypa/pip/issues/53>`_)

Bug Fixes
---------

- Fix ``pip install --pre`` for packages with pre-release build dependencies defined
both in ``pyproject.toml``'s ``build-system.requires`` and ``setup.py``'s
``setup_requires``. (`10222 <https://github.com/pypa/pip/issues/10222>`_)
- When pip rewrites the shebang line in a script during wheel installation,
update the hash and size in the corresponding ``RECORD`` file entry. (`10744 <https://github.com/pypa/pip/issues/10744>`_)
- Do not consider a ``.dist-info`` directory found inside a wheel-like zip file
as metadata for an installed distribution. A package in a wheel is (by
definition) not installed, and is not guaranteed to work due to how a wheel is
structured. (`11217 <https://github.com/pypa/pip/issues/11217>`_)
- Use ``importlib.resources`` to read the ``vendor.txt`` file in ``pip debug``.
This makes the command safe for use from a zipapp. (`11248 <https://github.com/pypa/pip/issues/11248>`_)
- Make the ``--use-pep517`` option of the ``download`` command apply not just
to the requirements specified on the command line, but to their dependencies,
as well. (`9523 <https://github.com/pypa/pip/issues/9523>`_)

Process
-------

- Remove reliance on the stdlib cgi module, which is deprecated in Python 3.11.

Vendored Libraries
------------------

- Remove html5lib.
- Upgrade certifi to 2022.6.15
- Upgrade chardet to 5.0.0
- Upgrade colorama to 0.4.5
- Upgrade distlib to 0.3.5
- Upgrade msgpack to 1.0.4
- Upgrade pygments to 2.12.0
- Upgrade pyparsing to 3.0.9
- Upgrade requests to 2.28.1
- Upgrade rich to 12.5.1
- Upgrade typing_extensions to 4.3.0
- Upgrade urllib3 to 1.26.10

22.1.2

===================

Bug Fixes
---------

- Revert `10979 <https://github.com/pypa/pip/issues/10979>`_ since it introduced a regression in certain edge cases. (`#10979 <https://github.com/pypa/pip/issues/10979>`_)
- Fix an incorrect assertion in the logging logic, that prevented the upgrade prompt from being presented. (`11136 <https://github.com/pypa/pip/issues/11136>`_)

22.1.1

===================

Bug Fixes
---------

- Properly filter out optional dependencies (i.e. extras) when checking build environment distributions. (`11112 <https://github.com/pypa/pip/issues/11112>`_)
- Change the build environment dependency checking to be opt-in. (`11116 <https://github.com/pypa/pip/issues/11116>`_)
- Allow using a pre-release version to satisfy a build requirement. This helps
manually populated build environments to more accurately detect build-time
requirement conflicts. (`11123 <https://github.com/pypa/pip/issues/11123>`_)

22.1

=================

Process
-------

- Enable the ``importlib.metadata`` metadata implementation by default on
Python 3.11 (or later). The environment variable ``_PIP_USE_IMPORTLIB_METADATA``
can still be used to enable the implementation on 3.10 and earlier, or disable
it on 3.11 (by setting it to ``0`` or ``false``).

Bug Fixes
---------

- Revert `9243 <https://github.com/pypa/pip/issues/9243>`_ since it introduced a regression in certain edge cases. (`#10962 <https://github.com/pypa/pip/issues/10962>`_)
- Fix missing ``REQUESTED`` metadata when using URL constraints. (`11079 <https://github.com/pypa/pip/issues/11079>`_)
- ``pip config`` now normalizes names by converting underscores into dashes. (`9330 <https://github.com/pypa/pip/issues/9330>`_)

22.1b1

===================

Process
-------

- Start migration of distribution metadata implementation from ``pkg_resources``
to ``importlib.metadata``. The new implementation is currently not exposed in
any user-facing way, but included in the code base for easier development.

Deprecations and Removals
-------------------------

- Drop ``--use-deprecated=out-of-tree-build``, according to deprecation message. (`11001 <https://github.com/pypa/pip/issues/11001>`_)

Features
--------

- Add option to install and uninstall commands to opt-out from running-as-root warning. (`10556 <https://github.com/pypa/pip/issues/10556>`_)
- Include Project-URLs in ``pip show`` output. (`10799 <https://github.com/pypa/pip/issues/10799>`_)
- Improve error message when ``pip config edit`` is provided an editor that
doesn't exist. (`10812 <https://github.com/pypa/pip/issues/10812>`_)
- Add a user interface for supplying config settings to build backends. (`11059 <https://github.com/pypa/pip/issues/11059>`_)
- Add support for Powershell autocompletion. (`9024 <https://github.com/pypa/pip/issues/9024>`_)
- Explains why specified version cannot be retrieved when *Requires-Python* is not satisfied. (`9615 <https://github.com/pypa/pip/issues/9615>`_)
- Validate build dependencies when using ``--no-build-isolation``. (`9794 <https://github.com/pypa/pip/issues/9794>`_)

Bug Fixes
---------

- Fix conditional checks to prevent ``pip.exe`` from trying to modify itself, on Windows. (`10560 <https://github.com/pypa/pip/issues/10560>`_)
- Fix uninstall editable from Windows junction link. (`10696 <https://github.com/pypa/pip/issues/10696>`_)
- Fallback to pyproject.toml-based builds if ``setup.py`` is present in a project, but ``setuptools`` cannot be imported. (`10717 <https://github.com/pypa/pip/issues/10717>`_)
- When checking for conflicts in the build environment, correctly skip requirements
containing markers that do not match the current environment. (`10883 <https://github.com/pypa/pip/issues/10883>`_)
- Disable brotli import in vendored urllib3 so brotli could be uninstalled/upgraded by pip. (`10950 <https://github.com/pypa/pip/issues/10950>`_)
- Prioritize URL credentials over netrc. (`10979 <https://github.com/pypa/pip/issues/10979>`_)
- Filter available distributions using hash declarations from constraints files. (`9243 <https://github.com/pypa/pip/issues/9243>`_)
- Fix an error when trying to uninstall packages installed as editable from a network drive. (`9452 <https://github.com/pypa/pip/issues/9452>`_)
- Fix pip install issues using a proxy due to an inconsistency in how Requests is currently handling variable precedence in session. (`9691 <https://github.com/pypa/pip/issues/9691>`_)

Vendored Libraries
------------------

- Upgrade CacheControl to 0.12.11
- Upgrade distro to 1.7.0
- Upgrade platformdirs to 2.5.2
- Remove ``progress`` from vendored dependencies.
- Upgrade ``pyparsing`` to 3.0.8 for startup performance improvements.
- Upgrade rich to 12.2.0
- Upgrade tomli to 2.0.1
- Upgrade typing_extensions to 4.2.0

Improved Documentation
----------------------

- Add more dedicated topic and reference pages to the documentation. (`10899 <https://github.com/pypa/pip/issues/10899>`_)
- Capitalise Y as the default for "Proceed (y/n)?" when uninstalling. (`10936 <https://github.com/pypa/pip/issues/10936>`_)
- Add ``scheme://`` requirement to ``--proxy`` option's description (`10951 <https://github.com/pypa/pip/issues/10951>`_)
- The wheel command now references the build interface section instead of stating the legacy
setuptools behavior as the default. (`10972 <https://github.com/pypa/pip/issues/10972>`_)
- Improved usefulness of ``pip config --help`` output. (`11074 <https://github.com/pypa/pip/issues/11074>`_)

22.0.4

===================

Deprecations and Removals
-------------------------

- Drop the doctype check, that presented a warning for index pages that use non-compliant HTML 5. (`10903 <https://github.com/pypa/pip/issues/10903>`_)

Vendored Libraries
------------------

- Downgrade distlib to 0.3.3.

22.0.3

===================

Features
--------

- Print the exception via ``rich.traceback``, when running with ``--debug``. (`10791 <https://github.com/pypa/pip/issues/10791>`_)

Bug Fixes
---------

- Only calculate topological installation order, for packages that are going to be installed/upgraded.

This fixes an `AssertionError` that occurred when determining installation order, for a very specific combination of upgrading-already-installed-package + change of dependencies + fetching some packages from a package index. This combination was especially common in Read the Docs' builds. (`10851 <https://github.com/pypa/pip/issues/10851>`_)
- Use ``html.parser`` by default, instead of falling back to ``html5lib`` when ``--use-deprecated=html5lib`` is not passed. (`10869 <https://github.com/pypa/pip/issues/10869>`_)

Improved Documentation
----------------------

- Clarify that using per-requirement overrides disables the usage of wheels. (`9674 <https://github.com/pypa/pip/issues/9674>`_)

22.0.2

===================

Deprecations and Removals
-------------------------

- Instead of failing on index pages that use non-compliant HTML 5, print a deprecation warning and fall back to ``html5lib``-based parsing for now. This simplifies the migration for non-compliant index pages, by letting such indexes function with a warning. (`10847 <https://github.com/pypa/pip/issues/10847>`_)

22.0.1

===================

Bug Fixes
---------

- Accept lowercase ``<!doctype html>`` on index pages. (`10844 <https://github.com/pypa/pip/issues/10844>`_)
- Properly handle links parsed by html5lib, when using ``--use-deprecated=html5lib``. (`10846 <https://github.com/pypa/pip/issues/10846>`_)

22.0

=================

Process
-------

- Completely replace :pypi:`tox` in our development workflow, with :pypi:`nox`.

Deprecations and Removals
-------------------------

- Deprecate alternative progress bar styles, leaving only ``on`` and ``off`` as available choices. (`10462 <https://github.com/pypa/pip/issues/10462>`_)
- Drop support for Python 3.6. (`10641 <https://github.com/pypa/pip/issues/10641>`_)
- Disable location mismatch warnings on Python versions prior to 3.10.

These warnings were helping identify potential issues as part of the sysconfig -> distutils transition, and we no longer need to rely on reports from older Python versions for information on the transition. (`10840 <https://github.com/pypa/pip/issues/10840>`_)

Features
--------

- Changed ``PackageFinder`` to parse HTML documents using the stdlib :class:`html.parser.HTMLParser` class instead of the ``html5lib`` package.

For now, the deprecated ``html5lib`` code remains and can be used with the ``--use-deprecated=html5lib`` command line option. However, it will be removed in a future pip release. (`10291 <https://github.com/pypa/pip/issues/10291>`_)
- Utilise ``rich`` for presenting pip's default download progress bar. (`10462 <https://github.com/pypa/pip/issues/10462>`_)
- Present a better error message when an invalid wheel file is encountered, providing more context where the invalid wheel file is. (`10535 <https://github.com/pypa/pip/issues/10535>`_)
- Documents the ``--require-virtualenv`` flag for ``pip install``. (`10588 <https://github.com/pypa/pip/issues/10588>`_)
- ``pip install <tab>`` autocompletes paths. (`10646 <https://github.com/pypa/pip/issues/10646>`_)
- Allow Python distributors to opt-out from or opt-in to the ``sysconfig`` installation scheme backend by setting ``sysconfig._PIP_USE_SYSCONFIG`` to ``True`` or ``False``. (`10647 <https://github.com/pypa/pip/issues/10647>`_)
- Make it possible to deselect tests requiring cryptography package on systems where it cannot be installed. (`10686 <https://github.com/pypa/pip/issues/10686>`_)
- Start using Rich for presenting error messages in a consistent format. (`10703 <https://github.com/pypa/pip/issues/10703>`_)
- Improve presentation of errors from subprocesses. (`10705 <https://github.com/pypa/pip/issues/10705>`_)
- Forward pip's verbosity configuration to VCS tools to control their output accordingly. (`8819 <https://github.com/pypa/pip/issues/8819>`_)

Bug Fixes
---------

- Optimize installation order calculation to improve performance when installing requirements that form a complex dependency graph with a large amount of edges. (`10557 <https://github.com/pypa/pip/issues/10557>`_)
- When a package is requested by the user for upgrade, correctly identify that the extra-ed variant of that same package depended by another user-requested package is requesting the same package, and upgrade it accordingly. (`10613 <https://github.com/pypa/pip/issues/10613>`_)
- Prevent pip from installing yanked releases unless explicitly pinned via the ``==`` or ``===`` operators. (`10617 <https://github.com/pypa/pip/issues/10617>`_)
- Stop backtracking on build failures, by instead surfacing them to the user and aborting immediately. This behaviour provides more immediate feedback when a package cannot be built due to missing build dependencies or platform incompatibility. (`10655 <https://github.com/pypa/pip/issues/10655>`_)
- Silence ``Value for <location> does not match`` warning caused by an erroneous patch in Slackware-distributed Python 3.9. (`10668 <https://github.com/pypa/pip/issues/10668>`_)
- Fix an issue where pip did not consider dependencies with and without extras to be equal (`9644 <https://github.com/pypa/pip/issues/9644>`_)

Vendored Libraries
------------------

- Upgrade CacheControl to 0.12.10
- Upgrade certifi to 2021.10.8
- Upgrade distlib to 0.3.4
- Upgrade idna to 3.3
- Upgrade msgpack to 1.0.3
- Upgrade packaging to 21.3
- Upgrade platformdirs to 2.4.1
- Add pygments 2.11.2 as a vendored dependency.
- Tree-trim unused portions of vendored pygments, to reduce the distribution size.
- Upgrade pyparsing to 3.0.7
- Upgrade Requests to 2.27.1
- Upgrade resolvelib to 0.8.1
- Add rich 11.0.0 as a vendored dependency.
- Tree-trim unused portions of vendored rich, to reduce the distribution size.
- Add typing_extensions 4.0.1 as a vendored dependency.
- Upgrade urllib3 to 1.26.8

21.3.1

===================


Bug Fixes
---------


- Always refuse installing or building projects that have no ``pyproject.toml`` nor
``setup.py``. (`10531 <https://github.com/pypa/pip/issues/10531>`_)
- Tweak running-as-root detection, to check ``os.getuid`` if it exists, on Unix-y and non-Linux/non-MacOS machines. (`10565 <https://github.com/pypa/pip/issues/10565>`_)
- When installing projects with a ``pyproject.toml`` in editable mode, and the build
backend does not support :pep:`660`, prepare metadata using
``prepare_metadata_for_build_wheel`` instead of ``setup.py egg_info``. Also, refuse
installing projects that only have a ``setup.cfg`` and no ``setup.py`` nor
``pyproject.toml``. These restore the pre-21.3 behaviour. (`10573 <https://github.com/pypa/pip/issues/10573>`_)
- Restore compatibility of where configuration files are loaded from on MacOS (back to ``Library/Application Support/pip``, instead of ``Preferences/pip``). (`10585 <https://github.com/pypa/pip/issues/10585>`_)

Vendored Libraries
------------------


- Upgrade pep517 to 0.12.0

21.3

=================

Deprecations and Removals
-------------------------

- Improve deprecation warning regarding the copying of source trees when installing from a local directory. (`10128 <https://github.com/pypa/pip/issues/10128>`_)
- Suppress location mismatch warnings when pip is invoked from a Python source
tree, so ``ensurepip`` does not emit warnings on CPython ``make install``. (`10270 <https://github.com/pypa/pip/issues/10270>`_)
- On Python 3.10 or later, the installation scheme backend has been changed to use
``sysconfig``. This is to anticipate the deprecation of ``distutils`` in Python
3.10, and its scheduled removal in 3.12. For compatibility considerations, pip
installations running on Python 3.9 or lower will continue to use ``distutils``. (`10358 <https://github.com/pypa/pip/issues/10358>`_)
- Remove the ``--build-dir`` option and aliases, one last time. (`10485 <https://github.com/pypa/pip/issues/10485>`_)
- In-tree builds are now the default. ``--use-feature=in-tree-build`` is now
ignored. ``--use-deprecated=out-of-tree-build`` may be used temporarily to ease
the transition. (`10495 <https://github.com/pypa/pip/issues/10495>`_)
- Un-deprecate source distribution re-installation behaviour. (`8711 <https://github.com/pypa/pip/issues/8711>`_)

Features
--------

- Replace vendored appdirs with platformdirs. (`10202 <https://github.com/pypa/pip/issues/10202>`_)
- Support `PEP 610 <https://www.python.org/dev/peps/pep-0610/>`_ to detect
editable installs in ``pip freeze`` and  ``pip list``. The ``pip list`` column output
has a new ``Editable project location`` column, and the JSON output has a new
``editable_project_location`` field. (`10249 <https://github.com/pypa/pip/issues/10249>`_)
- ``pip freeze`` will now always fallback to reporting the editable project
location when it encounters a VCS error while analyzing an editable
requirement. Before, it sometimes reported the requirement as non-editable. (`10410 <https://github.com/pypa/pip/issues/10410>`_)
- ``pip show`` now sorts ``Requires`` and ``Required-By`` alphabetically. (`10422 <https://github.com/pypa/pip/issues/10422>`_)
- Do not raise error when there are no files to remove with ``pip cache purge/remove``.
Instead log a warning and continue (to log that we removed 0 files). (`10459 <https://github.com/pypa/pip/issues/10459>`_)
- When backtracking during dependency resolution, prefer the dependencies which are involved in the most recent conflict. This can significantly reduce the amount of backtracking required. (`10479 <https://github.com/pypa/pip/issues/10479>`_)
- Cache requirement objects, to improve performance reducing reparses of requirement strings. (`10550 <https://github.com/pypa/pip/issues/10550>`_)
- Support editable installs for projects that have a ``pyproject.toml`` and use a
build backend that supports :pep:`660`. (`8212 <https://github.com/pypa/pip/issues/8212>`_)
- When a revision is specified in a Git URL, use git's partial clone feature to speed up source retrieval. (`9086 <https://github.com/pypa/pip/issues/9086>`_)
- Add a ``--debug`` flag, to enable a mode that doesn't log errors and propagates them to the top level instead. This is primarily to aid with debugging pip's crashes. (`9349 <https://github.com/pypa/pip/issues/9349>`_)
- If a host is explicitly specified as trusted by the user (via the --trusted-host option), cache HTTP responses from it in addition to HTTPS ones. (`9498 <https://github.com/pypa/pip/issues/9498>`_)

Bug Fixes
---------

- Present a better error message, when a ``file:`` URL is not found. (`10263 <https://github.com/pypa/pip/issues/10263>`_)
- Fix the auth credential cache to allow for the case in which
the index url contains the username, but the password comes
from an external source, such as keyring. (`10269 <https://github.com/pypa/pip/issues/10269>`_)
- Fix double unescape of HTML ``data-requires-python`` and ``data-yanked`` attributes. (`10378 <https://github.com/pypa/pip/issues/10378>`_)
- New resolver: Fixes depth ordering of packages during resolution, e.g. a dependency 2 levels deep will be ordered before a dependency 3 levels deep. (`10482 <https://github.com/pypa/pip/issues/10482>`_)
- Correctly indent metadata preparation messages in pip output. (`10524 <https://github.com/pypa/pip/issues/10524>`_)

Vendored Libraries
------------------

- Remove appdirs as a vendored dependency.
- Upgrade distlib to 0.3.3
- Upgrade distro to 1.6.0
- Patch pkg_resources to use platformdirs rather than appdirs.
- Add platformdirs as a vendored dependency.
- Upgrade progress to 1.6
- Upgrade resolvelib to 0.8.0
- Upgrade urllib3 to 1.26.7

Improved Documentation
----------------------

- Update links of setuptools as setuptools moved these documents. The Simple Repository link now points to PyPUG as that is the canonical place of packaging specification, and setuptools's ``easy_install`` is deprecated. (`10430 <https://github.com/pypa/pip/issues/10430>`_)
- Create a "Build System Interface" reference section, for documenting how pip interacts with build systems. (`10497 <https://github.com/pypa/pip/issues/10497>`_)

21.2.4

===================

Bug Fixes
---------

- Fix 3.6.0 compatibility in link comparison logic. (`10280 <https://github.com/pypa/pip/issues/10280>`_)

21.2.3

===================

Bug Fixes
---------

- Modify the ``sysconfig.get_preferred_scheme`` function check to be
compatible with CPython 3.10’s alphareleases. (`10252 <https://github.com/pypa/pip/issues/10252>`_)

21.2.2

===================

Bug Fixes
---------

- New resolver: When a package is specified with extras in constraints, and with
extras in non-constraint requirements, the resolver now correctly identifies the
constraint's existence and avoids backtracking. (`10233 <https://github.com/pypa/pip/issues/10233>`_)

21.2.1

===================

Process
-------

- The source distribution re-installation feature removal has been delayed to 21.3.

21.2

=================

Process
-------

- ``pip freeze``, ``pip list``, and ``pip show`` no longer normalize underscore
(``_``) in distribution names to dash (``-``). This is a side effect of the
migration to ``importlib.metadata``, since the underscore-dash normalization
behavior is non-standard and specific to setuptools. This should not affect
other parts of pip (for example, when feeding the ``pip freeze`` result back
into ``pip install``) since pip internally performs standard PEP 503
normalization independently to setuptools.

Deprecations and Removals
-------------------------

- Git version parsing is now done with regular expression to prepare for the
pending upstream removal of non-PEP-440 version parsing logic. (`10117 <https://github.com/pypa/pip/issues/10117>`_)
- Re-enable the "Value for ... does not match" location warnings to field a new
round of feedback for the ``distutils``-``sysconfig`` transition. (`10151 <https://github.com/pypa/pip/issues/10151>`_)
- Remove deprecated ``--find-links`` option in ``pip freeze`` (`9069 <https://github.com/pypa/pip/issues/9069>`_)

Features
--------

- New resolver: Loosen URL comparison logic when checking for direct URL reference
equivalency. The logic includes the following notable characteristics:

* The authentication part of the URL is explicitly ignored.
* Most of the fragment part, including ``egg=``, is explicitly ignored. Only
 ``subdirectory=`` and hash values (e.g. ``sha256=``) are kept.
* The query part of the URL is parsed to allow ordering differences. (`10002 <https://github.com/pypa/pip/issues/10002>`_)
- Support TOML v1.0.0 syntax in ``pyproject.toml``. (`10034 <https://github.com/pypa/pip/issues/10034>`_)
- Added a warning message for errors caused due to Long Paths being disabled on Windows. (`10045 <https://github.com/pypa/pip/issues/10045>`_)
- Change the encoding of log file from default text encoding to UTF-8. (`10071 <https://github.com/pypa/pip/issues/10071>`_)
- Log the resolved commit SHA when installing a package from a Git repository. (`10149 <https://github.com/pypa/pip/issues/10149>`_)
- Add a warning when passing an invalid requirement to ``pip uninstall``. (`4958 <https://github.com/pypa/pip/issues/4958>`_)
- Add new subcommand ``pip index`` used to interact with indexes, and implement
``pip index version`` to list available versions of a package. (`7975 <https://github.com/pypa/pip/issues/7975>`_)
- When pip is asked to uninstall a project without the dist-info/RECORD file
it will no longer traceback with FileNotFoundError,
but it will provide a better error message instead, such as::

   ERROR: Cannot uninstall foobar 0.1, RECORD file not found. You might be able to recover from this via: 'pip install --force-reinstall --no-deps foobar==0.1'.

When dist-info/INSTALLER is present and contains some useful information, the info is included in the error message instead::

   ERROR: Cannot uninstall foobar 0.1, RECORD file not found. Hint: The package was installed by rpm.

(`8954 <https://github.com/pypa/pip/issues/8954>`_)
- Add an additional level of verbosity. ``--verbose`` (and the shorthand ``-v``) now
contains significantly less output, and users that need complete full debug-level output
should pass it twice (``--verbose --verbose`` or ``-vv``). (`9450 <https://github.com/pypa/pip/issues/9450>`_)
- New resolver: The order of dependencies resolution has been tweaked to traverse
the dependency graph in a more breadth-first approach. (`9455 <https://github.com/pypa/pip/issues/9455>`_)
- Make "yes" the default choice in ``pip uninstall``'s prompt. (`9686 <https://github.com/pypa/pip/issues/9686>`_)
- Add a special error message when users forget the ``-r`` flag when installing. (`9915 <https://github.com/pypa/pip/issues/9915>`_)
- New resolver: A distribution's ``Requires-Python`` metadata is now checked
before its Python dependencies. This makes the resolver fail quicker when
there's an interpreter version conflict. (`9925 <https://github.com/pypa/pip/issues/9925>`_)
- Suppress "not on PATH" warning when ``--prefix`` is given. (`9931 <https://github.com/pypa/pip/issues/9931>`_)
- Include ``rustc`` version in pip's ``User-Agent``, when the system has ``rustc``. (`9987 <https://github.com/pypa/pip/issues/9987>`_)

Bug Fixes
---------

- Update vendored six to 1.16.0 and urllib3 to 1.26.5 (`10043 <https://github.com/pypa/pip/issues/10043>`_)
- Correctly allow PEP 517 projects to be detected without warnings in ``pip freeze``. (`10080 <https://github.com/pypa/pip/issues/10080>`_)
- Strip leading slash from a ``file://`` URL built from an path with the Windows
drive notation. This fixes bugs where the ``file://`` URL cannot be correctly
used as requirement, constraint, or index URLs on Windows. (`10115 <https://github.com/pypa/pip/issues/10115>`_)
- New resolver: URL comparison logic now treats ``file://localhost/`` and
``file:///`` as equivalent to conform to RFC 8089. (`10162 <https://github.com/pypa/pip/issues/10162>`_)
- Prefer credentials from the URL over the previously-obtained credentials from URLs of the same domain, so it is possible to use different credentials on the same index server for different ``--extra-index-url`` options. (`3931 <https://github.com/pypa/pip/issues/3931>`_)
- Fix extraction of files with utf-8 encoded paths from tars. (`7667 <https://github.com/pypa/pip/issues/7667>`_)
- Skip distutils configuration parsing on encoding errors. (`8931 <https://github.com/pypa/pip/issues/8931>`_)
- New resolver: Detect an unnamed requirement is user-specified (by building its
metadata for the project name) so it can be correctly ordered in the resolver. (`9204 <https://github.com/pypa/pip/issues/9204>`_)
- Fix :ref:`pip freeze` to output packages :ref:`installed from git <vcs support>`
in the correct ``git+protocol://git.example.com/MyProjectegg=MyProject`` format
rather than the old and no longer supported ``git+git`` format. (`9822 <https://github.com/pypa/pip/issues/9822>`_)
- Fix warnings about install scheme selection for Python framework builds
distributed by Apple's Command Line Tools. (`9844 <https://github.com/pypa/pip/issues/9844>`_)
- Relax interpreter detection to quelch a location mismatch warning where PyPy
is deliberately breaking backwards compatibility. (`9845 <https://github.com/pypa/pip/issues/9845>`_)

Vendored Libraries
------------------

- Upgrade certifi to 2021.05.30.
- Upgrade idna to 3.2.
- Upgrade packaging to 21.0
- Upgrade requests to 2.26.0.
- Upgrade resolvelib to 0.7.1.
- Upgrade urllib3 to 1.26.6.

21.1.3

===================

Bug Fixes
---------

- Remove unused optional ``tornado`` import in vendored ``tenacity`` to prevent old versions of Tornado from breaking pip. (`10020 <https://github.com/pypa/pip/issues/10020>`_)
- Require ``setup.cfg``-only projects to be built via PEP 517, by requiring an explicit dependency on setuptools declared in pyproject.toml. (`10031 <https://github.com/pypa/pip/issues/10031>`_)

21.1.2

===================

Bug Fixes
---------

- New resolver: Correctly exclude an already installed package if its version is
known to be incompatible to stop the dependency resolution process with a clear
error message. (`9841 <https://github.com/pypa/pip/issues/9841>`_)
- Allow ZIP to archive files with timestamps earlier than 1980. (`9910 <https://github.com/pypa/pip/issues/9910>`_)
- Emit clearer error message when a project root does not contain either
``pyproject.toml``, ``setup.py`` or ``setup.cfg``. (`9944 <https://github.com/pypa/pip/issues/9944>`_)
- Fix detection of existing standalone pip instance for PEP 517 builds. (`9953 <https://github.com/pypa/pip/issues/9953>`_)

21.1.1

===================

Deprecations and Removals
-------------------------

- Temporarily set the new "Value for ... does not match" location warnings level
to *DEBUG*, to hide them from casual users. This prepares pip 21.1 for CPython
inclusion, while pip maintainers digest the first intake of location mismatch
issues for the ``distutils``-``sysconfig`` transition. (`9912 <https://github.com/pypa/pip/issues/9912>`_)

Bug Fixes
---------

- This change fixes a bug on Python <=3.6.1 with a Typing feature added in 3.6.2 (`9831 <https://github.com/pypa/pip/issues/9831>`_)
- Fix compatibility between distutils and sysconfig when the project name is unknown outside of a virtual environment. (`9838 <https://github.com/pypa/pip/issues/9838>`_)
- Fix Python 3.6 compatibility when a PEP 517 build requirement itself needs to be
built in an isolated environment. (`9878 <https://github.com/pypa/pip/issues/9878>`_)

21.1

=================

Process
-------

- Start installation scheme migration from ``distutils`` to ``sysconfig``. A
warning is implemented to detect differences between the two implementations to
encourage user reports, so we can avoid breakages before they happen.

Features
--------

- Add the ability for the new resolver to process URL constraints. (`8253 <https://github.com/pypa/pip/issues/8253>`_)
- Add a feature ``--use-feature=in-tree-build`` to build local projects in-place
when installing. This is expected to become the default behavior in pip 21.3;
see `Installing from local packages <https://pip.pypa.io/en/stable/user_guide/#installing-from-local-packages>`_
for more information. (`9091 <https://github.com/pypa/pip/issues/9091>`_)
- Bring back the "(from versions: ...)" message, that was shown on resolution failures. (`9139 <https://github.com/pypa/pip/issues/9139>`_)
- Add support for editable installs for project with only setup.cfg files. (`9547 <https://github.com/pypa/pip/issues/9547>`_)
- Improve performance when picking the best file from indexes during ``pip install``. (`9748 <https://github.com/pypa/pip/issues/9748>`_)
- Warn instead of erroring out when doing a PEP 517 build in presence of
``--build-option``. Warn when doing a PEP 517 build in presence of
``--global-option``. (`9774 <https://github.com/pypa/pip/issues/9774>`_)

Bug Fixes
---------

- Fixed ``--target`` to work with ``--editable`` installs. (`4390 <https://github.com/pypa/pip/issues/4390>`_)
- Add a warning, discouraging the usage of pip as root, outside a virtual environment. (`6409 <https://github.com/pypa/pip/issues/6409>`_)
- Ignore ``.dist-info`` directories if the stem is not a valid Python distribution
name, so they don't show up in e.g. ``pip freeze``. (`7269 <https://github.com/pypa/pip/issues/7269>`_)
- Only query the keyring for URLs that actually trigger error 401.
This prevents an unnecessary keyring unlock prompt on every pip install
invocation (even with default index URL which is not password protected). (`8090 <https://github.com/pypa/pip/issues/8090>`_)
- Prevent packages already-installed alongside with pip to be injected into an
isolated build environment during build-time dependency population. (`8214 <https://github.com/pypa/pip/issues/8214>`_)
- Fix ``pip freeze`` permission denied error in order to display an understandable error message and offer solutions. (`8418 <https://github.com/pypa/pip/issues/8418>`_)
- Correctly uninstall script files (from setuptools' ``scripts`` argument), when installed with ``--user``. (`8733 <https://github.com/pypa/pip/issues/8733>`_)
- New resolver: When a requirement is requested both via a direct URL
(``req  URL``) and via version specifier with extras (``req[extra]``), the
resolver will now be able to use the URL to correctly resolve the requirement
with extras. (`8785 <https://github.com/pypa/pip/issues/8785>`_)
- New resolver: Show relevant entries from user-supplied constraint files in the
error message to improve debuggability. (`9300 <https://github.com/pypa/pip/issues/9300>`_)
- Avoid parsing version to make the version check more robust against lousily
debundled downstream distributions. (`9348 <https://github.com/pypa/pip/issues/9348>`_)
- ``--user`` is no longer suggested incorrectly when pip fails with a permission
error in a virtual environment. (`9409 <https://github.com/pypa/pip/issues/9409>`_)
- Fix incorrect reporting on ``Requires-Python`` conflicts. (`9541 <https://github.com/pypa/pip/issues/9541>`_)
- Make wheel compatibility tag preferences more important than the build tag (`9565 <https://github.com/pypa/pip/issues/9565>`_)
- Fix pip to work with warnings converted to errors. (`9779 <https://github.com/pypa/pip/issues/9779>`_)
- **SECURITY**: Stop splitting on unicode separators in git references,
which could be maliciously used to install a different revision on the
repository. (`9827 <https://github.com/pypa/pip/issues/9827>`_)

Vendored Libraries
------------------

- Update urllib3 to 1.26.4 to fix CVE-2021-28363
- Remove contextlib2.
- Upgrade idna to 3.1
- Upgrade pep517 to 0.10.0
- Upgrade vendored resolvelib to 0.7.0.
- Upgrade tenacity to 7.0.0

Improved Documentation
----------------------

- Update "setuptools extras" link to match upstream. (`4822829F-6A45-4202-87BA-A80482DF6D4E <https://github.com/pypa/pip/issues/4822829F-6A45-4202-87BA-A80482DF6D4E>`_)
- Improve SSL Certificate Verification docs and ``--cert`` help text. (`6720 <https://github.com/pypa/pip/issues/6720>`_)
- Add a section in the documentation to suggest solutions to the ``pip freeze`` permission denied issue. (`8418 <https://github.com/pypa/pip/issues/8418>`_)
- Add warning about ``--extra-index-url`` and dependency confusion (`9647 <https://github.com/pypa/pip/issues/9647>`_)
- Describe ``--upgrade-strategy`` and direct requirements explicitly; add a brief
example. (`9692 <https://github.com/pypa/pip/issues/9692>`_)

21.0.1

===================

Bug Fixes
---------

- commands: debug: Use packaging.version.parse to compare between versions. (`9461 <https://github.com/pypa/pip/issues/9461>`_)
- New resolver: Download and prepare a distribution only at the last possible
moment to avoid unnecessary network access when the same version is already
installed locally. (`9516 <https://github.com/pypa/pip/issues/9516>`_)

Vendored Libraries
------------------

- Upgrade packaging to 20.9

21.0

=================

Deprecations and Removals
-------------------------

- Drop support for Python 2. (`6148 <https://github.com/pypa/pip/issues/6148>`_)
- Remove support for legacy wheel cache entries that were created with pip
versions older than 20.0. (`7502 <https://github.com/pypa/pip/issues/7502>`_)
- Remove support for VCS pseudo URLs editable requirements. It was emitting
deprecation warning since version 20.0. (`7554 <https://github.com/pypa/pip/issues/7554>`_)
- Modernise the codebase after Python 2. (`8802 <https://github.com/pypa/pip/issues/8802>`_)
- Drop support for Python 3.5. (`9189 <https://github.com/pypa/pip/issues/9189>`_)
- Remove the VCS export feature that was used only with editable VCS
requirements and had correctness issues. (`9338 <https://github.com/pypa/pip/issues/9338>`_)

Features
--------

- Add ``--ignore-requires-python`` support to pip download. (`1884 <https://github.com/pypa/pip/issues/1884>`_)
- New resolver: Error message shown when a wheel contains inconsistent metadata
is made more helpful by including both values from the file name and internal
metadata. (`9186 <https://github.com/pypa/pip/issues/9186>`_)

Bug Fixes
---------

- Fix a regression that made ``pip wheel`` do a VCS export instead of a VCS clone
for editable requirements. This broke VCS requirements that need the VCS
information to build correctly. (`9273 <https://github.com/pypa/pip/issues/9273>`_)
- Fix ``pip download`` of editable VCS requirements that need VCS information
to build correctly. (`9337 <https://github.com/pypa/pip/issues/9337>`_)

Vendored Libraries
------------------

- Upgrade msgpack to 1.0.2.
- Upgrade requests to 2.25.1.

Improved Documentation
----------------------

- Render the unreleased pip version change notes on the news page in docs. (`9172 <https://github.com/pypa/pip/issues/9172>`_)
- Fix broken email link in docs feedback banners. (`9343 <https://github.com/pypa/pip/issues/9343>`_)

20.3.4

===================

Features
--------

- ``pip wheel`` now verifies the built wheel contains valid metadata, and can be
installed by a subsequent ``pip install``. This can be disabled with
``--no-verify``. (`9206 <https://github.com/pypa/pip/issues/9206>`_)
- Improve presentation of XMLRPC errors in pip search. (`9315 <https://github.com/pypa/pip/issues/9315>`_)

Bug Fixes
---------

- Fixed hanging VCS subprocess calls when the VCS outputs a large amount of data
on stderr. Restored logging of VCS errors that was inadvertently removed in pip
20.2. (`8876 <https://github.com/pypa/pip/issues/8876>`_)
- Fix error when an existing incompatibility is unable to be applied to a backtracked state. (`9180 <https://github.com/pypa/pip/issues/9180>`_)
- New resolver: Discard a faulty distribution, instead of quitting outright.
This implementation is taken from 20.2.2, with a fix that always makes the
resolver iterate through candidates from indexes lazily, to avoid downloading
candidates we do not need. (`9203 <https://github.com/pypa/pip/issues/9203>`_)
- New resolver: Discard a source distribution if it fails to generate metadata,
instead of quitting outright. This implementation is taken from 20.2.2, with a
fix that always makes the resolver iterate through candidates from indexes
lazily, to avoid downloading candidates we do not need. (`9246 <https://github.com/pypa/pip/issues/9246>`_)

Vendored Libraries
------------------

- Upgrade resolvelib to 0.5.4.

20.3.3

===================

Bug Fixes
---------

- Revert "Skip candidate not providing valid metadata", as that caused pip to be overeager about downloading from the package index. (`9264 <https://github.com/pypa/pip/issues/9264>`_)

20.3.2

===================

Features
--------

- New resolver: Resolve direct and pinned (``==`` or ``===``) requirements first
to improve resolver performance. (`9185 <https://github.com/pypa/pip/issues/9185>`_)
- Add a mechanism to delay resolving certain packages, and use it for setuptools. (`9249 <https://github.com/pypa/pip/issues/9249>`_)

Bug Fixes
---------

- New resolver: The "Requirement already satisfied" log is not printed only once
for each package during resolution. (`9117 <https://github.com/pypa/pip/issues/9117>`_)
- Fix crash when logic for redacting authentication information from URLs
in ``--help`` is given a list of strings, instead of a single string. (`9191 <https://github.com/pypa/pip/issues/9191>`_)
- New resolver: Correctly implement PEP 592. Do not return yanked versions from
an index, unless the version range can only be satisfied by yanked candidates. (`9203 <https://github.com/pypa/pip/issues/9203>`_)
- New resolver: Make constraints also apply to package variants with extras, so
the resolver correctly avoids backtracking on them. (`9232 <https://github.com/pypa/pip/issues/9232>`_)
- New resolver: Discard a candidate if it fails to provide metadata from source,
or if the provided metadata is inconsistent, instead of quitting outright. (`9246 <https://github.com/pypa/pip/issues/9246>`_)

Vendored Libraries
------------------

- Update vendoring to 20.8

Improved Documentation
----------------------

- Update documentation to reflect that pip still uses legacy resolver by default in Python 2 environments. (`9269 <https://github.com/pypa/pip/issues/9269>`_)

20.3.1

===================

Deprecations and Removals
-------------------------

- The --build-dir option has been restored as a no-op, to soften the transition
for tools that still used it. (`9193 <https://github.com/pypa/pip/issues/9193>`_)

20.3

- Introduce a new ResolutionImpossible error, raised when pip encounters un-satisfiable dependency conflicts (`8546 <https://github.com/pypa/pip/issues/8546>`_, `#8377 <https://github.com/pypa/pip/issues/8377>`_)
- Add a subcommand ``debug`` to ``pip config`` to list available configuration sources and the key-value pairs defined in them. (`6741 <https://github.com/pypa/pip/issues/6741>`_)
- Warn if index pages have unexpected content-type (`6754 <https://github.com/pypa/pip/issues/6754>`_)
- Allow specifying ``--prefer-binary`` option in a requirements file (`7693 <https://github.com/pypa/pip/issues/7693>`_)
- Generate PEP 376 REQUESTED metadata for user supplied requirements installed
by pip. (`7811 <https://github.com/pypa/pip/issues/7811>`_)
- Warn if package url is a vcs or an archive url with invalid scheme (`8128 <https://github.com/pypa/pip/issues/8128>`_)
- Parallelize network operations in ``pip list``. (`8504 <https://github.com/pypa/pip/issues/8504>`_)
- Allow the new resolver to obtain dependency information through wheels
lazily downloaded using HTTP range requests.  To enable this feature,
invoke ``pip`` with ``--use-feature=fast-deps``. (`8588 <https://github.com/pypa/pip/issues/8588>`_)
- Support ``--use-feature`` in requirements files (`8601 <https://github.com/pypa/pip/issues/8601>`_)

Bug Fixes
---------

- Use canonical package names while looking up already installed packages. (`5021 <https://github.com/pypa/pip/issues/5021>`_)
- Fix normalizing path on Windows when installing package on another logical disk. (`7625 <https://github.com/pypa/pip/issues/7625>`_)
- The VCS commands run by pip as subprocesses don't merge stdout and stderr anymore, improving the output parsing by subsequent commands. (`7968 <https://github.com/pypa/pip/issues/7968>`_)
- Correctly treat non-ASCII entry point declarations in wheels so they can be
installed on Windows. (`8342 <https://github.com/pypa/pip/issues/8342>`_)
- Update author email in config and tests to reflect decommissioning of pypa-dev list. (`8454 <https://github.com/pypa/pip/issues/8454>`_)
- Headers provided by wheels in .data directories are now correctly installed
into the user-provided locations, such as ``--prefix``, instead of the virtual
environment pip is running in. (`8521 <https://github.com/pypa/pip/issues/8521>`_)

Vendored Libraries
------------------

- Vendored htmlib5 no longer imports deprecated xml.etree.cElementTree on Python 3.
- Upgrade appdirs to 1.4.4
- Upgrade certifi to 2020.6.20
- Upgrade distlib to 0.3.1
- Upgrade html5lib to 1.1
- Upgrade idna to 2.10
- Upgrade packaging to 20.4
- Upgrade requests to 2.24.0
- Upgrade six to 1.15.0
- Upgrade toml to 0.10.1
- Upgrade urllib3 to 1.25.9

Improved Documentation
----------------------

- Add ``--no-input`` option to pip docs (`7688 <https://github.com/pypa/pip/issues/7688>`_)
- List of options supported in requirements file are extracted from source of truth,
instead of being maintained manually. (`7908 <https://github.com/pypa/pip/issues/7908>`_)
- Fix pip config docstring so that the subcommands render correctly in the docs (`8072 <https://github.com/pypa/pip/issues/8072>`_)
- replace links to the old pypa-dev mailing list with https://mail.python.org/mailman3/lists/distutils-sig.python.org/ (`#8353 <https://github.com/pypa/pip/issues/8353>`_)
- Fix example for defining multiple values for options which support them (`8373 <https://github.com/pypa/pip/issues/8373>`_)
- Add documentation for the ResolutionImpossible error that helps the user fix dependency conflicts (`8459 <https://github.com/pypa/pip/issues/8459>`_)
- Add feature flags to docs (`8512 <https://github.com/pypa/pip/issues/8512>`_)
- Document how to install package extras from git branch and source distributions. (`8576 <https://github.com/pypa/pip/issues/8576>`_)

20.3b1

===================

Deprecations and Removals
-------------------------

- ``pip freeze`` will stop filtering the ``pip``, ``setuptools``, ``distribute`` and ``wheel`` packages from ``pip freeze`` output in a future version.
To keep the previous behavior, users should use the new ``--exclude`` option. (`4256 <https://github.com/pypa/pip/issues/4256>`_)
- Deprecate support for Python 3.5 (`8181 <https://github.com/pypa/pip/issues/8181>`_)
- Document that certain removals can be fast tracked. (`8417 <https://github.com/pypa/pip/issues/8417>`_)
- Document that Python versions are generally supported until PyPI usage falls below 5%. (`8927 <https://github.com/pypa/pip/issues/8927>`_)
- Deprecate ``--find-links`` option in ``pip freeze`` (`9069 <https://github.com/pypa/pip/issues/9069>`_)

Features
--------

- Add ``--exclude`` option to ``pip freeze`` and ``pip list`` commands to explicitly exclude packages from the output. (`4256 <https://github.com/pypa/pip/issues/4256>`_)
- Allow multiple values for --abi and --platform. (`6121 <https://github.com/pypa/pip/issues/6121>`_)
- Add option ``--format`` to subcommand ``list`` of ``pip  cache``, with ``abspath`` choice to output the full path of a wheel file. (`8355 <https://github.com/pypa/pip/issues/8355>`_)
- Improve error message friendliness when an environment has packages with
corrupted metadata. (`8676 <https://github.com/pypa/pip/issues/8676>`_)
- Make the ``setup.py install`` deprecation warning less noisy. We warn only
when ``setup.py install`` succeeded and ``setup.py bdist_wheel`` failed, as
situations where both fails are most probably irrelevant to this deprecation. (`8752 <https://github.com/pypa/pip/issues/8752>`_)
- Check the download directory for existing wheels to possibly avoid
fetching metadata when the ``fast-deps`` feature is used with
``pip wheel`` and ``pip download``. (`8804 <https://github.com/pypa/pip/issues/8804>`_)
- When installing a git URL that refers to a commit that is not available locally
after git clone, attempt to fetch it from the remote. (`8815 <https://github.com/pypa/pip/issues/8815>`_)
- Include http subdirectory in ``pip cache info`` and ``pip cache purge`` commands. (`8892 <https://github.com/pypa/pip/issues/8892>`_)
- Cache package listings on index packages so they are guaranteed to stay stable
during a pip command session. This also improves performance when a index page
is accessed multiple times during the command session. (`8905 <https://github.com/pypa/pip/issues/8905>`_)
- New resolver: Tweak resolution logic to improve user experience when
user-supplied requirements conflict. (`8924 <https://github.com/pypa/pip/issues/8924>`_)
- Support Python 3.9. (`8971 <https://github.com/pypa/pip/issues/8971>`_)
- Log an informational message when backtracking takes multiple rounds on a specific package. (`8975 <https://github.com/pypa/pip/issues/8975>`_)
- Switch to the new dependency resolver by default. (`9019 <https://github.com/pypa/pip/issues/9019>`_)
- Remove the ``--build-dir`` option, as per the deprecation. (`9049 <https://github.com/pypa/pip/issues/9049>`_)

Bug Fixes
---------

- Propagate ``--extra-index-url`` from requirements file properly to session auth,
so that keyring auth will work as expected. (`8103 <https://github.com/pypa/pip/issues/8103>`_)
- Allow specifying verbosity and quiet level via configuration files
and environment variables. Previously these options were treated as
boolean values when read from there while through CLI the level can be
specified. (`8578 <https://github.com/pypa/pip/issues/8578>`_)
- Only converts Windows path to unicode on Python 2 to avoid regressions when a
POSIX environment does not configure the file system encoding correctly. (`8658 <https://github.com/pypa/pip/issues/8658>`_)
- List downloaded distributions before exiting ``pip download``
when using the new resolver to make the behavior the same as
that on the legacy resolver. (`8696 <https://github.com/pypa/pip/issues/8696>`_)
- New resolver: Pick up hash declarations in constraints files and use them to
filter available distributions. (`8792 <https://github.com/pypa/pip/issues/8792>`_)
- Avoid polluting the destination directory by resolution artifacts
when the new resolver is used for ``pip download`` or ``pip wheel``. (`8827 <https://github.com/pypa/pip/issues/8827>`_)
- New resolver: If a package appears multiple times in user specification with
different ``--hash`` options, only hashes that present in all specifications
should be allowed. (`8839 <https://github.com/pypa/pip/issues/8839>`_)
- Tweak the output during dependency resolution in the new resolver. (`8861 <https://github.com/pypa/pip/issues/8861>`_)
- Correctly search for installed distributions in new resolver logic in order
to not miss packages (virtualenv packages from system-wide-packages for example) (`8963 <https://github.com/pypa/pip/issues/8963>`_)
- Do not fail in pip freeze when encountering a ``direct_url.json`` metadata file
with editable=True. Render it as a non-editable ``file://`` URL until modern
editable installs are standardized and supported. (`8996 <https://github.com/pypa/pip/issues/8996>`_)

Vendored Libraries
------------------

- Fix devendoring instructions to explicitly state that ``vendor.txt`` should not be removed.
It is mandatory for ``pip debug`` command.

Improved Documentation
----------------------

- Add documentation for '.netrc' support. (`7231 <https://github.com/pypa/pip/issues/7231>`_)
- Add OS tabs for OS-specific commands. (`7311 <https://github.com/pypa/pip/issues/7311>`_)
- Add note and example on keyring support for index basic-auth (`8636 <https://github.com/pypa/pip/issues/8636>`_)
- Added initial UX feedback widgets to docs. (`8783 <https://github.com/pypa/pip/issues/8783>`_, `#8848 <https://github.com/pypa/pip/issues/8848>`_)
- Add ux documentation (`8807 <https://github.com/pypa/pip/issues/8807>`_)
- Update user docs to reflect new resolver as default in 20.3. (`9044 <https://github.com/pypa/pip/issues/9044>`_)
- Improve migration guide to reflect changes in new resolver behavior. (`9056 <https://github.com/pypa/pip/issues/9056>`_)

20.2.4

===================

Deprecations and Removals
-------------------------

- Document that certain removals can be fast tracked. (`8417 <https://github.com/pypa/pip/issues/8417>`_)
- Document that Python versions are generally supported until PyPI usage falls below 5%. (`8927 <https://github.com/pypa/pip/issues/8927>`_)

Features
--------

- New resolver: Avoid accessing indexes when the installed candidate is preferred
and considered good enough. (`8023 <https://github.com/pypa/pip/issues/8023>`_)
- Improve error message friendliness when an environment has packages with
corrupted metadata. (`8676 <https://github.com/pypa/pip/issues/8676>`_)
- Cache package listings on index packages so they are guaranteed to stay stable
during a pip command session. This also improves performance when a index page
is accessed multiple times during the command session. (`8905 <https://github.com/pypa/pip/issues/8905>`_)
- New resolver: Tweak resolution logic to improve user experience when
user-supplied requirements conflict. (`8924 <https://github.com/pypa/pip/issues/8924>`_)

Bug Fixes
---------

- New resolver: Correctly respect ``Requires-Python`` metadata to reject
incompatible packages in ``--no-deps`` mode. (`8758 <https://github.com/pypa/pip/issues/8758>`_)
- New resolver: Pick up hash declarations in constraints files and use them to
filter available distributions. (`8792 <https://github.com/pypa/pip/issues/8792>`_)
- New resolver: If a package appears multiple times in user specification with
different ``--hash`` options, only hashes that present in all specifications
should be allowed. (`8839 <https://github.com/pypa/pip/issues/8839>`_)

Improved Documentation
----------------------

- Add ux documentation (`8807 <https://github.com/pypa/pip/issues/8807>`_)

20.2.3

===================

Deprecations and Removals
-------------------------

- Deprecate support for Python 3.5 (`8181 <https://github.com/pypa/pip/issues/8181>`_)

Features
--------

- Make the ``setup.py install`` deprecation warning less noisy. We warn only
when ``setup.py install`` succeeded and ``setup.py bdist_wheel`` failed, as
situations where both fails are most probably irrelevant to this deprecation. (`8752 <https://github.com/pypa/pip/issues/8752>`_)

20.2.2

===================

Bug Fixes
---------

- Only attempt to use the keyring once and if it fails, don't try again.
This prevents spamming users with several keyring unlock prompts when they
cannot unlock or don't want to do so. (`8090 <https://github.com/pypa/pip/issues/8090>`_)
- Fix regression that distributions in system site-packages are not correctly
found when a virtual environment is configured with ``system-site-packages``
on. (`8695 <https://github.com/pypa/pip/issues/8695>`_)
- Disable caching for range requests, which causes corrupted wheels
when pip tries to obtain metadata using the feature ``fast-deps``. (`8701 <https://github.com/pypa/pip/issues/8701>`_, `#8716 <https://github.com/pypa/pip/issues/8716>`_)
- Always use UTF-8 to read ``pyvenv.cfg`` to match the built-in ``venv``. (`8717 <https://github.com/pypa/pip/issues/8717>`_)
- 2020 Resolver: Correctly handle marker evaluation in constraints and exclude
them if their markers do not match the current environment. (`8724 <https://github.com/pypa/pip/issues/8724>`_)

20.2.1

===================

Features
--------

- Ignore require-virtualenv in ``pip list`` (`8603 <https://github.com/pypa/pip/issues/8603>`_)

Bug Fixes
---------

- Correctly find already-installed distributions with dot (``.``) in the name
and uninstall them when needed. (`8645 <https://github.com/pypa/pip/issues/8645>`_)
- Trace a better error message on installation failure due to invalid ``.data``
files in wheels. (`8654 <https://github.com/pypa/pip/issues/8654>`_)
- Fix SVN version detection for alternative SVN distributions. (`8665 <https://github.com/pypa/pip/issues/8665>`_)
- New resolver: Correctly include the base package when specified with extras
in ``--no-deps`` mode. (`8677 <https://github.com/pypa/pip/issues/8677>`_)
- Use UTF-8 to handle ZIP archive entries on Python 2 according to PEP 427, so
non-ASCII paths can be resolved as expected. (`8684 <https://github.com/pypa/pip/issues/8684>`_)

Improved Documentation
----------------------

- Add details on old resolver deprecation and removal to migration documentation. (`8371 <https://github.com/pypa/pip/issues/8371>`_)
- Fix feature flag name in docs. (`8660 <https://github.com/pyp

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