--upgrade-strategy eager in environment setup leads to VersionConflict

[fwitte]

Details

• Read the Docs project URL: tespy.readthedocs.io
• Build URL (if applicable):
  • https://readthedocs.org/projects/tespy/builds/15254849/
  • https://readthedocs.org/projects/tespy/builds/15234704/ (pull request build)
• Read the Docs username (if applicable): fwitte
• GitHub repository link: https://github.com/oemof/tespy

Expected Result

The installation of dependencies in two steps (first sphinx and stuff, then the actual package, TESPy) should work smoothly.

Actual Result

Build fails due to ContextualVersionConflict.

Reason

• pyparsing is first installed in version 2.4.7 (from packaging->sphinx>=1.3->-r docs/requirements.txt), requirement: pyparsing<3,>=2.0.2
• pyparsing is then installed in version 3.0.5 (from matplotlib<4,>=3.2.1->TESPy==0.5.1.dev0), requirement pyparsing>=2.2.1

This leads to the error above and cancels the build. This might be somewhat related (#7345) but since I am not too familiar with the pip strategies applied on readthedocs, I wanted to ask, if this is a bug. Or should I just add a pyparsing<3 requirement to the setup.py dependencies of TESPy? Maybe there is a more ellegant solution?

I would also guess, that any other package with a similar matplotlib dependency would lead to the same issue.

Thank you very much for your help, have a nice weekend

[stsewd]

Looks like this is a matplolib issue, matplotlib/matplotlib#21446. It was already fixed, but they need a new release.

[fwitte]

Thanks for letting me know! :) Should we keep this open, until the matplotlib version is released?

[stsewd]

I think it's fine closing, as this isn't specific to rtd, but to the dependencies of sphinx and matplotlib