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  • pip 20.3 release (heads-up for potential disruption)

    From Sumana Harihareswara@21:1/5 to All on Mon Nov 30 08:27:25 2020
    On behalf of the Python Packaging Authority, I am pleased to announce
    that we have just released pip 20.3, a new version of pip. You can
    install it by running `python -m pip install --upgrade pip`.

    This is an important and disruptive release -- we explained why in a
    blog post last year https://pyfound.blogspot.com/2019/12/moss-czi-support-pip.html . We even
    made a video about it: https://www.youtube.com/watch?v=B4GQCBBsuNU .

    Blog post with details: https://pyfound.blogspot.com/2020/11/pip-20-3-new-resolver.html

    Highlights include:

    * **DISRUPTION**: Switch to the new dependency resolver by
    default. Watch out for changes in handling editable
    installs, constraints files, and more:

    https://pip.pypa.io/en/latest/user_guide/#changes-to-the-pip-dependency-resolver-in-20-3-2020

    * **DEPRECATION**: Deprecate support for Python 3.5 (to be removed in
    pip 21.0)

    * **DEPRECATION**: 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.

    * Support for PEP 600: Future ‘manylinux’ Platform Tags for Portable
    Linux Built Distributions.

    * Add support for MacOS Big Sur compatibility tags.

    The new resolver is now *on by default*. It is significantly stricter
    and more consistent when it receives incompatible instructions, and
    reduces support for certain kinds of constraints files, so some
    workarounds and workflows may break. Please see our guide on how to
    test and migrate, and how to report issues: https://pip.pypa.io/en/latest/user_guide/#changes-to-the-pip-dependency-resolver-in-20-3-2020
    . You can use the deprecated (old) resolver, using the flag `--use-deprecated=legacy-resolver`, until we remove it in the pip 21.0
    release in January 2021.

    In pip 21.0 we will also remove support for Python 2.7.

    You can find more details (including deprecations and removals) [in the changelog](https://pip.pypa.io/en/stable/news/), and you can find
    thank-yous and instructions on reporting issues at https://pyfound.blogspot.com/2020/11/pip-20-3-new-resolver.html .

    Thank you,
    Sumana Harihareswara
    pip project manager
    Changeset Consulting
    https://changeset.nyc

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