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) <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) <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 during pip 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 distribution
name, 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 install
invocation (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 an
isolated build environment during build-time dependency population. ([#8214](https://github.com/pypa/pip/issues/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) <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]), 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) <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) <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) <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) <https://github.com/pypa/pip/issues/9409>_)
Fix incorrect reporting on Requires-Python conflicts. ([#9541](https://github.com/pypa/pip/issues/9541) <https://github.com/pypa/pip/issues/9541>_)
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Bumps pip from 18.1 to 21.1.
Changelog
Sourced from pip's changelog.
... (truncated)
Commits
2b2a268Bump for releaseea761a6Update AUTHORS.txt2edd3fdPostpone a deprecation to 21.23cccfbfRename mislabeled news fragment21cd124Fix NEWS.rst placeholder positione46bddaMerge pull request #9827 from pradyunsg/fix-git-improper-tag-handling0e4938d:newspaper:ca832b2Don't split git references on unicode separators1320bacMerge pull request #9814 from pradyunsg/revamp-ci-apr-2021-v2e9cc23fSkip checks on PRs onlyDependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
@dependabot rebase.Dependabot commands and options
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