test with new version of pip

[brainwane]

Hi! This is a heads-up regarding important changes to pip, from Sumana, pip project manager and fellow Center for Cybersecurity person. :-) This year we've overhauled the dependency resolution logic in pip. And testing your Python applications with the current beta, pip 20.3b1 https://pypi.org/project/pip/20.3b1/ , will help your team make a smoother transition.

We want to release pip 20.3 in a week or two, assuming we don't hear of new showstopper bugs. But we don't want to make it harder for data scientists like you to use Python, in this particularly volatile moment, to track election-related incidents. So please do some pre-testing with the beta this week, if you can, and file bugs about problems you run into.

The next-generation dependency resolver 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. More on how to test and migrate: https://pip.pypa.io/en/latest/user_guide/#changes-to-the-pip-dependency-resolver-in-20-3-2020

The full changelog is at https://pip.pypa.io/en/latest/news/ .

Also, you can sign up for our user experience studies, so you can help us shape the future of Python packaging: http://bit.ly/pip-ux-recruitment-sign-up