• PackagingWG
• 2020-11-25-pip-small-meeting

Sunday 25 Nov

Pradyun-Sumana meeting

• On Big Sur support - updated https://github.com/pypa/pip/issues/8936

  • TODO: Sumana to mark in release announcement
• to triage -- updated several issues, such as #9143, #9020, and #9139
• Releasing a beta for 20.3 right now.
  • add attention admonition on top:
    • Major and minor releases of pip also include changes listed within prior beta releases

    • PR opened: https://github.com/pypa/pip/pull/9173

• Add "no-deps" suggestion to user guide - migration
  • change step 4 to "Troubleshoot and try these workarounds"

    • use --no-deps when you are sure you don't want pip to actually resolve dependencies, because you are using a set of packages that work together in reality even though their metadata says that they conflict [this is a workaround -- see https://pip.pypa.io/en/latest/user_guide/#fixing-conflicting-dependencies re longterm solution]

    • read https://pip.pypa.io/en/latest/user_guide/#dependency-resolution-backtracking for ways to reduce the time pip spends backtracking

    • use the old resolver [reuse existing language]

  • change pointers to resolver testing survey to GitHub issue?

    • no. Pradyun will look frequently

Major changes in this release:

1. DISRUPTION: Switch to the new dependency resolver by default. (#9019) 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

2. DEPRECATION: Deprecate support for Python 3.5 (to be removed in pip 21.0) (#8181)
3. DEPRECATION ANNOUNCEMENT: 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)
4. Substantial improvements in new resolver for performance, output and error messages, avoiding infinite loops, and support for constraints files.
5. Support for PEP 600: Future ‘manylinux’ Platform Tags for Portable Linux Built Distributions. (#9077)
6. Documentation improvements: Resolver migration guide, quickstart guide, and new documentation theme.
7. Add support for MacOS Big Sur compatibility tags. (#9138)