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Pin pip to latest version 24.3.1 #722

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This PR pins pip to the latest release 24.3.1.

Changelog

24.3.1

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

Bug Fixes
---------

- Allow multiple nested inclusions of the same requirements file again. (`13046 <https://github.com/pypa/pip/issues/13046>`_)

24.3

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

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

- Deprecate wheel filenames that are not compliant with :pep:`440`. (`12918 <https://github.com/pypa/pip/issues/12918>`_)

Features
--------

- Detect recursively referencing requirements files and help users identify
the source. (`12653 <https://github.com/pypa/pip/issues/12653>`_)
- Support for :pep:`730` iOS wheels. (`12961 <https://github.com/pypa/pip/issues/12961>`_)

Bug Fixes
---------

- Display a better error message when an already installed package has an invalid requirement. (`12953 <https://github.com/pypa/pip/issues/12953>`_)
- Ignore ``PIP_TARGET`` and ``pip.conf`` ``global.target`` when preparing a build environment. (`8438 <https://github.com/pypa/pip/issues/8438>`_)
- Restore support for macOS 10.12 and older (via truststore). (`12901 <https://github.com/pypa/pip/issues/12901>`_)
- Allow installing pip in editable mode in a virtual environment on Windows. (`12666 <https://github.com/pypa/pip/issues/12666>`_)

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

- Upgrade certifi to 2024.8.30
- Upgrade distlib to 0.3.9
- Upgrade truststore to 0.10.0
- Upgrade urllib3 to 1.26.20

24.2

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

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

- Deprecate ``pip install --editable`` falling back to ``setup.py develop``
when using a setuptools version that does not support :pep:`660`
(setuptools v63 and older). (`11457 <https://github.com/pypa/pip/issues/11457>`_)

Features
--------

- Check unsupported packages for the current platform. (`11054 <https://github.com/pypa/pip/issues/11054>`_)
- Use system certificates *and* certifi certificates to verify HTTPS connections on Python 3.10+.
Python 3.9 and earlier only use certifi.

To revert to previous behaviour, pass the flag ``--use-deprecated=legacy-certs``. (`11647 <https://github.com/pypa/pip/issues/11647>`_)
- Improve discovery performance of installed packages when the ``importlib.metadata``
backend is used to load distribution metadata (used by default under Python 3.11+). (`12656 <https://github.com/pypa/pip/issues/12656>`_)
- Improve performance when the same requirement string appears many times during
resolution, by consistently caching the parsed requirement string. (`12663 <https://github.com/pypa/pip/issues/12663>`_)
- Minor performance improvement of finding applicable package candidates by not
repeatedly calculating their versions (`12664 <https://github.com/pypa/pip/issues/12664>`_)
- Disable pip's self version check when invoking a pip subprocess to install
PEP 517 build requirements. (`12683 <https://github.com/pypa/pip/issues/12683>`_)
- Improve dependency resolution performance by caching platform compatibility
tags during wheel cache lookup. (`12712 <https://github.com/pypa/pip/issues/12712>`_)
- ``wheel`` is no longer explicitly listed as a build dependency of ``pip``.
``setuptools`` injects this dependency in the ``get_requires_for_build_wheel()``
hook and no longer needs it on newer versions. (`12728 <https://github.com/pypa/pip/issues/12728>`_)
- Ignore ``--require-virtualenv`` for ``pip check`` and ``pip freeze`` (`12842 <https://github.com/pypa/pip/issues/12842>`_)
- Improve package download and install performance.

Increase chunk sizes when downloading (256 kB, up from 10 kB) and reading files (1 MB, up from 8 kB).
This reduces the frequency of updates to pip's progress bar. (`12810 <https://github.com/pypa/pip/issues/12810>`_)
- Improve pip install performance.

Files are now extracted in 1MB blocks, or in one block matching the file size for
smaller files. A decompressor is no longer instantiated when extracting 0 bytes files,
it is not necessary because there is no data to decompress. (`12803 <https://github.com/pypa/pip/issues/12803>`_)

Bug Fixes
---------

- Set ``no_color`` to global ``rich.Console`` instance. (`11045 <https://github.com/pypa/pip/issues/11045>`_)
- Fix resolution to respect ``--python-version`` when checking ``Requires-Python``. (`12216 <https://github.com/pypa/pip/issues/12216>`_)
- Perform hash comparisons in a case-insensitive manner. (`12680 <https://github.com/pypa/pip/issues/12680>`_)
- Avoid ``dlopen`` failure for glibc detection in musl builds (`12716 <https://github.com/pypa/pip/issues/12716>`_)
- Avoid keyring logging crashes when pip is run in verbose mode. (`12751 <https://github.com/pypa/pip/issues/12751>`_)
- Fix finding hardlink targets in tar files with an ignored top-level directory. (`12781 <https://github.com/pypa/pip/issues/12781>`_)
- Improve pip install performance by only creating required parent
directories once, instead of before extracting every file in the wheel. (`12782 <https://github.com/pypa/pip/issues/12782>`_)
- Improve pip install performance by calculating installed packages printout
in linear time instead of quadratic time. (`12791 <https://github.com/pypa/pip/issues/12791>`_)

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

- Remove vendored tenacity.
- Update the preload list for the ``DEBUNDLED`` case, to replace ``pep517`` that has been renamed to ``pyproject_hooks``.
- Use tomllib from the stdlib if available, rather than tomli
- Upgrade certifi to 2024.7.4
- Upgrade platformdirs to 4.2.2
- Upgrade pygments to 2.18.0
- Upgrade setuptools to 70.3.0
- Upgrade typing_extensions to 4.12.2

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

- Correct ``—-ignore-conflicts`` (including an em dash) to ``--ignore-conflicts``. (`12851 <https://github.com/pypa/pip/issues/12851>`_)

24.1.2

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

Bug Fixes
---------

- Fix finding hardlink targets in tar files with an ignored top-level directory. (`12781 <https://github.com/pypa/pip/issues/12781>`_)

24.1.1

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

Bug Fixes
---------

- Actually use system trust stores when the truststore feature is enabled.

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

- Upgrade requests to 2.32.3

24.1

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

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

- Upgrade truststore to 0.9.1.

24.1b2

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

Features
--------

- Report informative messages about invalid requirements. (`12713 <https://github.com/pypa/pip/issues/12713>`_)

Bug Fixes
---------

- Eagerly import the self version check logic to avoid crashes while upgrading or downgrading pip at the same time. (`12675 <https://github.com/pypa/pip/issues/12675>`_)
- Accommodate for mismatches between different sources of truth for extra names, for packages generated by ``setuptools``. (`12688 <https://github.com/pypa/pip/issues/12688>`_)
- Accommodate for development versions of CPython ending in ``+`` in the version string. (`12691 <https://github.com/pypa/pip/issues/12691>`_)

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

- Upgrade packaging to 24.1
- Upgrade requests to 2.32.0
- Remove vendored colorama
- Remove vendored six
- Remove vendored webencodings
- Remove vendored charset_normalizer

``requests`` provides optional character detection support on some APIs when processing ambiguous bytes. This isn't relevant for pip to function and we're able to remove it due to recent upstream changes.

24.1b1

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

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

- Drop support for EOL Python 3.7. (`11934 <https://github.com/pypa/pip/issues/11934>`_)
- Remove support for legacy versions and dependency specifiers.

Packages with non standard-compliant versions or dependency specifiers are now ignored by the resolver.
Already installed packages with non standard-compliant versions or dependency specifiers
must be uninstalled before upgrading them. (`12063 <https://github.com/pypa/pip/issues/12063>`_)

Features
--------

- Improve performance of resolution of large dependency trees, with more caching. (`12453 <https://github.com/pypa/pip/issues/12453>`_)
- Further improve resolution performance of large dependency trees, by caching hash calculations. (`12657 <https://github.com/pypa/pip/issues/12657>`_)
- Reduce startup time of commands (e.g. show, freeze) that do not access the network by 15-30%. (`4768 <https://github.com/pypa/pip/issues/4768>`_)
- Reword and improve presentation of uninstallation errors. (`10421 <https://github.com/pypa/pip/issues/10421>`_)
- Add a 'raw' progress_bar type for simple and parsable download progress reports (`11508 <https://github.com/pypa/pip/issues/11508>`_)
- ``pip list`` no longer performs the pip version check unless ``--outdated`` or ``--uptodate`` is given. (`11677 <https://github.com/pypa/pip/issues/11677>`_)
- Use the ``data_filter`` when extracting tarballs, if it's available. (`12111 <https://github.com/pypa/pip/issues/12111>`_)
- Display the Project-URL value under key "Home-page" in ``pip show`` when the Home-Page metadata field is not set.

The Project-URL key detection is case-insensitive, and ignores any dashes and underscores. (`11221 <https://github.com/pypa/pip/issues/11221>`_)

Bug Fixes
---------

- Ensure ``-vv`` gets passed to any ``pip install`` build environment subprocesses. (`12577 <https://github.com/pypa/pip/issues/12577>`_)
- Deduplicate entries in the ``Requires`` field of ``pip show``. (`12165 <https://github.com/pypa/pip/issues/12165>`_)
- Fix error on checkout for subversion and bazaar with verbose mode on. (`11050 <https://github.com/pypa/pip/issues/11050>`_)
- Fix exception with completions when COMP_CWORD is not set (`12401 <https://github.com/pypa/pip/issues/12401>`_)
- Fix intermittent "cannot locate t64.exe" errors when upgrading pip. (`12666 <https://github.com/pypa/pip/issues/12666>`_)
- Remove duplication in invalid wheel error message (`12579 <https://github.com/pypa/pip/issues/12579>`_)
- Remove the incorrect pip3.x console entrypoint from the pip wheel. This console
script continues to be generated by pip when it installs itself. (`12536 <https://github.com/pypa/pip/issues/12536>`_)
- Gracefully skip VCS detection in pip freeze when PATH points to a non-directory path. (`12567 <https://github.com/pypa/pip/issues/12567>`_)
- Make the ``--proxy`` parameter take precedence over environment variables. (`10685 <https://github.com/pypa/pip/issues/10685>`_)

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

- Add charset-normalizer 3.3.2
- Remove chardet
- Remove pyparsing
- Upgrade CacheControl to 0.14.0
- Upgrade certifi to 2024.2.2
- Upgrade distro to 1.9.0
- Upgrade idna to 3.7
- Upgrade msgpack to 1.0.8
- Upgrade packaging to 24.0
- Upgrade platformdirs to 4.2.1
- Upgrade pygments to 2.17.2
- Upgrade rich to 13.7.1
- Upgrade setuptools to 69.5.1
- Upgrade tenacity to 8.2.3
- Upgrade typing_extensions to 4.11.0
- Upgrade urllib3 to 1.26.18

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

- Document UX research done on pip. (`10745 <https://github.com/pypa/pip/issues/10745>`_)
- Fix the direct usage of zipapp showing up as ``python -m pip.pyz`` rather than ``./pip.pyz`` / ``.\pip.pyz`` (`12043 <https://github.com/pypa/pip/issues/12043>`_)
- Add a warning explaining that the snippet in "Fallback behavior" is not a valid
``pyproject.toml`` snippet for projects, and link to setuptools documentation
instead. (`12122 <https://github.com/pypa/pip/issues/12122>`_)
- The Python Support Policy has been updated. (`12529 <https://github.com/pypa/pip/issues/12529>`_)
- Document the environment variables that correspond with CLI options. (`12576 <https://github.com/pypa/pip/issues/12576>`_)
- Update architecture documentation for command line interface. (`6831 <https://github.com/pypa/pip/issues/6831>`_)

Process
-------

- Remove ``setup.py`` since all the pip project metadata is now declared in
``pyproject.toml``.
- Move remaining pip development tools configurations to ``pyproject.toml``.

24.0

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

Features
--------

- Retry on HTTP status code 502 (`11843 <https://github.com/pypa/pip/issues/11843>`_)
- Automatically use the setuptools PEP 517 build backend when ``--config-settings`` is
used for projects without ``pyproject.toml``. (`11915 <https://github.com/pypa/pip/issues/11915>`_)
- Make pip freeze and pip uninstall of legacy editable installs of packages whose name
contains ``_`` compatible with ``setuptools>=69.0.3``. (`12477 <https://github.com/pypa/pip/issues/12477>`_)
- Support per requirement ``--config-settings`` for editable installs. (`12480 <https://github.com/pypa/pip/issues/12480>`_)

Bug Fixes
---------

- Optimized usage of ``--find-links=<path-to-dir>``, by only scanning the relevant directory once, only considering file names that are valid wheel or sdist names, and only considering files in the directory that are related to the install. (`12327 <https://github.com/pypa/pip/issues/12327>`_)
- Removed ``wheel`` from the ``[build-system].requires`` list fallback
that is used when ``pyproject.toml`` is absent. (`12449 <https://github.com/pypa/pip/issues/12449>`_)

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

- Upgrade distlib to 0.3.8

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

- Fix explanation of how PIP_CONFIG_FILE works (`11815 <https://github.com/pypa/pip/issues/11815>`_)
- Fix outdated pip install argument description in documentation. (`12417 <https://github.com/pypa/pip/issues/12417>`_)
- Replace some links to PEPs with links to the canonical specifications on the :doc:`pypug:index` (`12434 <https://github.com/pypa/pip/issues/12434>`_)
- Updated the ``pyproject.toml`` document to stop suggesting
to depend on ``wheel`` as a build dependency directly. (`12449 <https://github.com/pypa/pip/issues/12449>`_)
- Update supported interpreters in development docs (`12475 <https://github.com/pypa/pip/issues/12475>`_)

Process
-------

- Most project metadata is now defined statically via pip's ``pyproject.toml`` file.

23.3.2

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

Bug Fixes
---------

- Fix a bug in extras handling for link requirements (`12372 <https://github.com/pypa/pip/issues/12372>`_)
- Fix mercurial revision "parse error": use ``--rev={ref}`` instead of ``-r={ref}`` (`12373 <https://github.com/pypa/pip/issues/12373>`_)

23.3.1

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

Bug Fixes
---------

- Handle a timezone indicator of Z when parsing dates in the self check. (`12338 <https://github.com/pypa/pip/issues/12338>`_)
- Fix bug where installing the same package at the same time with multiple pip processes could fail. (`12361 <https://github.com/pypa/pip/issues/12361>`_)

23.3

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

Process
-------

- Added reference to `vulnerability reporting guidelines <https://www.python.org/dev/security/>`_ to pip's security policy.

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

- Drop a fallback to using SecureTransport on macOS. It was useful when pip detected OpenSSL older than 1.0.1, but the current pip does not support any Python version supporting such old OpenSSL versions. (`12175 <https://github.com/pypa/pip/issues/12175>`_)

Features
--------

- Improve extras resolution for multiple constraints on same base package. (`11924 <https://github.com/pypa/pip/issues/11924>`_)
- Improve use of datastructures to make candidate selection 1.6x faster. (`12204 <https://github.com/pypa/pip/issues/12204>`_)
- Allow ``pip install --dry-run`` to use platform and ABI overriding options. (`12215 <https://github.com/pypa/pip/issues/12215>`_)
- Add ``is_yanked`` boolean entry to the installation report (``--report``) to indicate whether the requirement was yanked from the index, but was still selected by pip conform to :pep:`592`. (`12224 <https://github.com/pypa/pip/issues/12224>`_)

Bug Fixes
---------

- Ignore errors in temporary directory cleanup (show a warning instead). (`11394 <https://github.com/pypa/pip/issues/11394>`_)
- Normalize extras according to :pep:`685` from package metadata in the resolver
for comparison. This ensures extras are correctly compared and merged as long
as the package providing the extra(s) is built with values normalized according
to the standard. Note, however, that this *does not* solve cases where the
package itself contains unnormalized extra values in the metadata. (`11649 <https://github.com/pypa/pip/issues/11649>`_)
- Prevent downloading sdists twice when :pep:`658` metadata is present. (`11847 <https://github.com/pypa/pip/issues/11847>`_)
- Include all requested extras in the install report (``--report``). (`11924 <https://github.com/pypa/pip/issues/11924>`_)
- Removed uses of ``datetime.datetime.utcnow`` from non-vendored code. (`12005 <https://github.com/pypa/pip/issues/12005>`_)
- Consistently report whether a dependency comes from an extra. (`12095 <https://github.com/pypa/pip/issues/12095>`_)
- Fix completion script for zsh (`12166 <https://github.com/pypa/pip/issues/12166>`_)
- Fix improper handling of the new onexc argument of ``shutil.rmtree()`` in Python 3.12. (`12187 <https://github.com/pypa/pip/issues/12187>`_)
- Filter out yanked links from the available versions error message: "(from versions: 1.0, 2.0, 3.0)" will not contain yanked versions conform PEP 592. The yanked versions (if any) will be mentioned in a separate error message. (`12225 <https://github.com/pypa/pip/issues/12225>`_)
- Fix crash when the git version number contains something else than digits and dots. (`12280 <https://github.com/pypa/pip/issues/12280>`_)
- Use ``-r=...`` instead of ``-r ...`` to specify references with Mercurial. (`12306 <https://github.com/pypa/pip/issues/12306>`_)
- Redact password from URLs in some additional places. (`12350 <https://github.com/pypa/pip/issues/12350>`_)
- pip uses less memory when caching large packages. As a result, there is a new on-disk cache format stored in a new directory ($PIP_CACHE_DIR/http-v2). (`2984 <https://github.com/pypa/pip/issues/2984>`_)

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

- Upgrade certifi to 2023.7.22
- Add truststore 0.8.0
- Upgrade urllib3 to 1.26.17

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

- Document that ``pip search`` support has been removed from PyPI (`12059 <https://github.com/pypa/pip/issues/12059>`_)
- Clarify --prefer-binary in CLI and docs (`12122 <https://github.com/pypa/pip/issues/12122>`_)
- Document that using OS-provided Python can cause pip's test suite to report false failures. (`12334 <https://github.com/pypa/pip/issues/12334>`_)

23.2.1

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

Bug Fixes
---------

- Disable :pep:`658` metadata fetching with the legacy resolver. (`12156 <https://github.com/pypa/pip/issues/12156>`_)

23.2

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

Process
-------

- Deprecate support for eggs for Python 3.11 or later, when the new ``importlib.metadata`` backend is used to load distribution metadata. This only affects the egg *distribution format* (with the ``.egg`` extension); distributions using the ``.egg-info`` *metadata format* (but are not actually eggs) are not affected. For more information about eggs, see `relevant section in the setuptools documentation <https://setuptools.pypa.io/en/stable/deprecated/python_eggs.html>`__.

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

- Deprecate legacy version and version specifiers that don't conform to the
:ref:`specification <pypug:version-specifiers>`.
(`12063 <https://github.com/pypa/pip/issues/12063>`_)
- ``freeze`` no longer excludes the ``setuptools``, ``distribute``, and ``wheel``
from the output when running on Python 3.12 or later, where they are not
included in a virtual environment by default. Use ``--exclude`` if you wish to
exclude any of these packages. (`4256 <https://github.com/pypa/pip/issues/4256>`_)

Features
--------

- make rejection messages slightly different between 1 and 8, so the user can make the difference. (`12040 <https://github.com/pypa/pip/issues/12040>`_)

Bug Fixes
---------

- Fix ``pip completion --zsh``. (`11417 <https://github.com/pypa/pip/issues/11417>`_)
- Prevent downloading files twice when :pep:`658` metadata is present (`11847 <https://github.com/pypa/pip/issues/11847>`_)
- Add permission check before configuration (`11920 <https://github.com/pypa/pip/issues/11920>`_)
- Fix deprecation warnings in Python 3.12 for usage of shutil.rmtree (`11957 <https://github.com/pypa/pip/issues/11957>`_)
- Ignore invalid or unreadable ``origin.json`` files in the cache of locally built wheels. (`11985 <https://github.com/pypa/pip/issues/11985>`_)
- Fix installation of packages with :pep:`658` metadata using non-canonicalized names (`12038 <https://github.com/pypa/pip/issues/12038>`_)
- Correctly parse ``dist-info-metadata`` values from JSON-format index data. (`12042 <https://github.com/pypa/pip/issues/12042>`_)
- Fail with an error if the ``--python`` option is specified after the subcommand name. (`12067 <https://github.com/pypa/pip/issues/12067>`_)
- Fix slowness when using ``importlib.metadata`` (the default way for pip to read metadata in Python 3.11+) and there is a large overlap between already installed and to-be-installed packages. (`12079 <https://github.com/pypa/pip/issues/12079>`_)
- Pass the ``-r`` flag to mercurial to be explicit that a revision is passed and protect
against ``hg`` options injection as part of VCS URLs. Users that do not have control on
VCS URLs passed to pip are advised to upgrade. (`12119 <https://github.com/pypa/pip/issues/12119>`_)

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

- Upgrade certifi to 2023.5.7
- Upgrade platformdirs to 3.8.1
- Upgrade pygments to 2.15.1
- Upgrade pyparsing to 3.1.0
- Upgrade Requests to 2.31.0
- Upgrade rich to 13.4.2
- Upgrade setuptools to 68.0.0
- Updated typing_extensions to 4.6.0
- Upgrade typing_extensions to 4.7.1
- Upgrade urllib3 to 1.26.16

23.1.2

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

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

- Upgrade setuptools to 67.7.2

23.1.1

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

Bug Fixes
---------

- Revert `11487 <https://github.com/pypa/pip/pull/11487>`_, as it causes issues with virtualenvs created by the Windows Store distribution of Python. (`#11987 <https://github.com/pypa/pip/issues/11987>`_)

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

- Revert pkg_resources (via setuptools) back to 65.6.3

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

- Update documentation to reflect the new behavior of using the cache of locally
built wheels in hash-checking mode. (`11967 <https://github.com/pypa/pip/issues/11967>`_)

23.1

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

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

- Remove support for the deprecated ``--install-options``. (`11358 <https://github.com/pypa/pip/issues/11358>`_)
- ``--no-binary`` does not imply ``setup.py install`` anymore. Instead a wheel will be
built locally and installed. (`11451 <https://github.com/pypa/pip/issues/11451>`_)
- ``--no-binary`` does not disable the cache of locally built wheels anymore. It only
means "don't download wheels". (`11453 <https://github.com/pypa/pip/issues/11453>`_)
- Deprecate ``--build-option`` and ``--global-option``. Users are invited to switch to
``--config-settings``. (`11859 <https://github.com/pypa/pip/issues/11859>`_)
- Using ``--config-settings`` with projects that don't have a ``pyproject.toml`` now prints
a deprecation warning. In the future the presence of config settings will automatically
enable the default build backend for legacy projects and pass the settings to it. (`11915 <https://github.com/pypa/pip/issues/11915>`_)
- Remove ``setup.py install`` fallback when building a wheel failed for projects without
``pyproject.toml``. (`8368 <https://github.com/pypa/pip/issues/8368>`_)
- When the ``wheel`` package is not installed, pip now uses the default build backend
instead of ``setup.py install`` and ``setup.py develop`` for project without
``pyproject.toml``. (`8559 <https://github.com/pypa/pip/issues/8559>`_)

Features
--------

- Specify egg-link location in assertion message when it does not match installed location to provide better error message for debugging. (`10476 <https://github.com/pypa/pip/issues/10476>`_)
- Present conflict information during installation after each choice that is rejected (pass ``-vv`` to ``pip install`` to show it) (`10937 <https://github.com/pypa/pip/issues/10937>`_)
- Display dependency chain on each Collecting/Processing log line. (`11169 <https://github.com/pypa/pip/issues/11169>`_)
- Support a per-requirement ``--config-settings`` option in requirements files. (`11325 <https://github.com/pypa/pip/issues/11325>`_)
- The ``--config-settings``/``-C`` option now supports using the same key multiple
times. When the same key is specified multiple times, all values are passed to
the build backend as a list, as opposed to the previous behavior, where pip would
only pass the last value if the same key was used multiple times. (`11681 <https://github.com/pypa/pip/issues/11681>`_)
- Add ``-C`` as a short version of the ``--config-settings`` option. (`11786 <https://github.com/pypa/pip/issues/11786>`_)
- Reduce the number of resolver rounds, since backjumping makes the resolver more efficient in finding solutions. This also makes pathological cases fail quicker. (`11908 <https://github.com/pypa/pip/issues/11908>`_)
- Warn if ``--hash`` is used on a line without requirement in a requirements file. (`11935 <https://github.com/pypa/pip/issues/11935>`_)
- Stop propagating CLI ``--config-settings`` to the build dependencies. They already did
not propagate to requirements provided in requirement files. To pass the same config
settings to several requirements, users should provide the requirements as CLI
arguments. (`11941 <https://github.com/pypa/pip/issues/11941>`_)
- Support wheel cache when using ``--require-hashes``. (`5037 <https://github.com/pypa/pip/issues/5037>`_)
- Add ``--keyring-provider`` flag. See the Authentication page in the documentation for more info. (`8719 <https://github.com/pypa/pip/issues/8719>`_)
- In the case of virtual environments, configuration files are now also included from the base installation. (`9752 <https://github.com/pypa/pip/issues/9752>`_)

Bug Fixes
---------

- Fix grammar by changing "A new release of pip available:" to "A new release of pip is available:" in the notice used for indicating that. (`11529 <https://github.com/pypa/pip/issues/11529>`_)
- Normalize paths before checking if installed scripts are on PATH. (`11719 <https://github.com/pypa/pip/issues/11719>`_)
- Correct the way to decide if keyring is available. (`11774 <https://github.com/pypa/pip/issues/11774>`_)
- More consistent resolution backtracking by removing legacy hack related to setuptools resolution (`11837 <https://github.com/pypa/pip/issues/11837>`_)
- Include ``AUTHORS.txt`` in pip's wheels. (`11882 <https://github.com/pypa/pip/issues/11882>`_)
- The ``uninstall`` and ``install --force-reinstall`` commands no longer call
``normalize_path()`` repeatedly on the same paths. Instead, these results are
cached for the duration of an uninstall operation, resulting in improved
performance, particularly on Windows. (`11889 <https://github.com/pypa/pip/issues/11889>`_)
- Fix and improve the parsing of hashes embedded in URL fragments. (`11936 <https://github.com/pypa/pip/issues/11936>`_)
- When package A depends on package B provided as a direct URL dependency including a hash
embedded in the link, the ``--require-hashes`` option did not warn when user supplied hashes
were missing for package B. (`11938 <https://github.com/pypa/pip/issues/11938>`_)
- Correctly report ``requested_extras`` in the installation report when extras are
specified for a local directory installation. (`11946 <https://github.com/pypa/pip/issues/11946>`_)
- When installing an archive from a direct URL or local file, populate
``download_info.info.hashes`` in the installation report, in addition to the legacy
``download_info.info.hash`` key. (`11948 <https://github.com/pypa/pip/issues/11948>`_)

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

- Upgrade msgpack to 1.0.5
- Patch pkg_resources to remove dependency on ``jaraco.text``.
- Upgrade platformdirs to 3.2.0
- Upgrade pygments to 2.14.0
- Upgrade resolvelib to 1.0.1
- Upgrade rich to 13.3.3
- Upgrade setuptools to 67.6.1
- Upgrade tenacity to 8.2.2
- Upgrade typing_extensions to 4.5.0
- Upgrade urllib3 to 1.26.15

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

- Cross-reference the ``--python`` flag from the ``--prefix`` flag,
and mention limitations of ``--prefix`` regarding script installation. (`11775 <https://github.com/pypa/pip/issues/11775>`_)
- Add SECURITY.md to make the policy official. (`11809 <https://github.com/pypa/pip/issues/11809>`_)
- Add username to Git over SSH example. (`11838 <https://github.com/pypa/pip/issues/11838>`_)
- Quote extras in the pip install docs to guard shells with default glob
qualifiers, like zsh. (`11842 <https://github.com/pypa/pip/issues/11842>`_)
- Make it clear that requirements/constraints file can be a URL (`11954 <https://github.com/pypa/pip/issues/11954>`_)

23.0.1

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

Features
--------

- Ignore PIP_REQUIRE_VIRTUALENV for ``pip index`` (`11671 <https://github.com/pypa/pip/issues/11671>`_)
- Implement ``--break-system-packages`` to permit installing packages into
``EXTERNALLY-MANAGED`` Python installations. (`11780 <https://github.com/pypa/pip/issues/11780>`_)

Bug Fixes
---------

- Improve handling of isolated build environments on platforms that
customize the Python's installation schemes, such as Debian and
Homebrew. (`11740 <https://github.com/pypa/pip/issues/11740>`_)
- Do not crash in presence of misformatted hash field in ``direct_url.json``. (`11773 <https://github.com/pypa/pip/issues/11773>`_)

23.0

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

Features
--------

- Change the hashes in the installation report to be a mapping. Emit the
``archive_info.hashes`` dictionary in ``direct_url.json``. (`11312 <https://github.com/pypa/pip/issues/11312>`_)
- Implement logic to read the ``EXTERNALLY-MANAGED`` file as specified in :pep:`668`.
This allows a downstream Python distributor to prevent users from using pip to
modify the externally managed environment. (`11381 <https://github.com/pypa/pip/issues/11381>`_)
- Enable the use of ``keyring`` found on ``PATH``. This allows ``keyring``
installed using ``pipx`` to be used by ``pip``. (`11589 <https://github.com/pypa/pip/issues/11589>`_)
- The inspect and installation report formats are now declared stable, and their version
has been bumped from ``0`` to ``1``. (`11757 <https://github.com/pypa/pip/issues/11757>`_)

Bug Fixes
---------

- Wheel cache behavior is restored to match previous versions, allowing the
cache to find existing entries. (`11527 <https://github.com/pypa/pip/issues/11527>`_)
- Use the "venv" scheme if available to obtain prefixed lib paths. (`11598 <https://github.com/pypa/pip/issues/11598>`_)
- Deprecated a historical ambiguity in how ``egg`` fragments in URL-style
requirements are formatted and handled. ``egg`` fragments that do not look
like :pep:`508` names now produce a deprecation warning. (`11617 <https://github.com/pypa/pip/issues/11617>`_)
- Fix scripts path in isolated build environment on Debian. (`11623 <https://github.com/pypa/pip/issues/11623>`_)
- Make ``pip show`` show the editable location if package is editable (`11638 <https://github.com/pypa/pip/issues/11638>`_)
- Stop checking that ``wheel`` is present when ``build-system.requires``
is provided without ``build-system.build-backend`` as ``setuptools``
(which we still check for) will inject it anyway. (`11673 <https://github.com/pypa/pip/issues/11673>`_)
- Fix an issue when an already existing in-memory distribution would cause
exceptions in ``pip install`` (`11704 <https://github.com/pypa/pip/issues/11704>`_)

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

- Upgrade certifi to 2022.12.7
- Upgrade chardet to 5.1.0
- Upgrade colorama to 0.4.6
- Upgrade distro to 1.8.0
- Remove pep517 from vendored packages
- Upgrade platformdirs to 2.6.2
- Add pyproject-hooks 1.0.0
- Upgrade requests to 2.28.2
- Upgrade rich to 12.6.0
- Upgrade urllib3 to 1.26.14

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

- Fixed the description of the option "--install-options" in the documentation (`10265 <https://github.com/pypa/pip/issues/10265>`_)
- Remove mention that editable installs are necessary for pip freeze to report the VCS
URL. (`11675 <https://github.com/pypa/pip/issues/11675>`_)
- Clarify that the egg URL fragment is only necessary for editable VCS installs, and
otherwise not necessary anymore. (`11676 <https://github.com/pypa/pip/issues/11676>`_)

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 successfully 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 error

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