Sourced frompip's changelog.

21.1 (2021-04-24)

Process

• Start installation scheme migration fromdistutils tosysconfig. Awarning is implemented to detect differences between the two implementations toencourage 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) <https://github.com/pypa/pip/issues/8253>_)
• Add a feature--use-feature=in-tree-build to build local projects in-placewhen installing. This is expected to become the default behavior in pip 21.3;seeInstalling 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) <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) <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) <https://github.com/pypa/pip/issues/9547>_)
• Improve performance when picking the best file from indexes duringpip install. ([#9748](https://github.com/pypa/pip/issues/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) <https://github.com/pypa/pip/issues/9774>_)

Bug Fixes

• Fixed--target to work with--editable installs. ([#4390](https://github.com/pypa/pip/issues/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) <https://github.com/pypa/pip/issues/6409>_)
• Ignore.dist-info directories if the stem is not a valid Python distributionname, so they don't show up in e.g.pip freeze. ([#7269](https://github.com/pypa/pip/issues/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 installinvocation (even with default index URL which is not password protected). ([#8090](https://github.com/pypa/pip/issues/8090) <https://github.com/pypa/pip/issues/8090>_)
• Prevent packages already-installed alongside with pip to be injected into anisolated build environment during build-time dependency population. ([#8214](https://github.com/pypa/pip/issues/8214) <https://github.com/pypa/pip/issues/8214>_)
• Fixpip freeze permission denied error in order to display an understandable error message and offer solutions. ([#8418](https://github.com/pypa/pip/issues/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) <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]), theresolver will now be able to use the URL to correctly resolve the requirementwith extras. ([#8785](https://github.com/pypa/pip/issues/8785) <https://github.com/pypa/pip/issues/8785>_)
• New resolver: Show relevant entries from user-supplied constraint files in theerror message to improve debuggability. ([#9300](https://github.com/pypa/pip/issues/9300) <https://github.com/pypa/pip/issues/9300>_)
• Avoid parsing version to make the version check more robust against lousilydebundled downstream distributions. ([#9348](https://github.com/pypa/pip/issues/9348) <https://github.com/pypa/pip/issues/9348>_)
• --user is no longer suggested incorrectly when pip fails with a permissionerror in a virtual environment. ([#9409](https://github.com/pypa/pip/issues/9409) <https://github.com/pypa/pip/issues/9409>_)
• Fix incorrect reporting onRequires-Python conflicts. ([#9541](https://github.com/pypa/pip/issues/9541) <https://github.com/pypa/pip/issues/9541>_)

... (truncated)

• 2b2a268 Bump for release
• ea761a6 Update AUTHORS.txt
• 2edd3fd Postpone a deprecation to 21.2
• 3cccfbf Rename mislabeled news fragment
• 21cd124 Fix NEWS.rst placeholder position
• e46bdda Merge pull request#9827 from pradyunsg/fix-git-improper-tag-handling
• 0e4938d 📰
• ca832b2 Don't split git references on unicode separators
• 1320bac Merge pull request#9814 from pradyunsg/revamp-ci-apr-2021-v2
• e9cc23f Skip checks on PRs only
• Additional commits viewable incompare view

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