Test & Code3 Aug 2020

124: pip dependency resolver changes

pip is the package installer for Python.

Often, when you run pip, especially the first time in a new virtual environment, you will see something like:

WARNING: You are using pip version 20.1.1; however, version 20.2 is available.

You should consider upgrading via the 'python -m pip install --upgrade pip' command.

And you should. Because 20.2 has a new dependency resolver.

Get in the habit, until October, of replacing pip install with pip install --use-feature=2020-resolver.

This flag is new in the 20.2 release.

This new pip dependency resolver is the result of a lot of work.

Five of the people involved with this work are joining the show today: Bernard Tyers, Nicole Harris, Paul Moore, Pradyun Gedam, and Tzu-ping Chung.

We talk about:

pip dependency resolver changes
user experience research and testing
crafting good error messages
efforts to improve the test suite
testing pip with pytest
some of the difficulties with testing pip
working with a team on a large project
working with a large code base
bringing new developers into a large project

Special Guests: Bernard Tyers, Nicole Harris, Paul Moore, Pradyun Gedam, and Tzu-ping Chung.

Links:

Changelog — pip 20.2 documentation — Including --use-feature=2020-resolver
pypa/pip: The Python package installer — github repo
testing pip - documentation
pip - The Python Package Installer — pip 20.2 documentation
Changes to the pip dependency resolver in 20.2 — Changes to the pip dependency resolver in 20.2

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