Build problems on Python 3.9.2

[bast]

Build problems on Python 3.9.2

[bast]

OK false alarm. It seems pip was too old and I was surprised that it needs to be upgraded separately. Thanks for testing.

[bast]

I am on Python 3.9.2 and my local setuptools is 54.2.0 so the inconsistency seems to be arriving from the environment.

[samumantha]

Overread the python version and created a new conda environment with pip and the requirements for Python 3.9.4 which seems to be working, trying again with Python 3.9.2 now

[bast]

Interesting. Same problematic behavior for me installing only sphinx-lesson:

python -m venv venv
source venv/bin/activate
python -m pip install sphinx-lesson

[samumantha]

Same results with Python 3.9.2, I am on Ubuntu 20.04.2, and used conda to create an environment with Python 3.9.2, installed pip into it and then the requirements. Setup tools Version is 52.0.0 after this and sphinx-build runs without issues on the documentation lesson.

[rkdarst]

do you know what your old and new versions of pip were?
I recently learned that pip basically doesn't resolve dependencies: it goes through and handles it top to bottom. I knew it was bad, but not that bad: https://stackoverflow.com/a/55826767
I had been meaning to research this more to see just what the situation is, but hadn't gotten around to it yet.

I see recent pip has been adding a new resolver but haven't yet learned a lot about it. It has all kind of implications for my crusade against unnecessary pinning of dependencies (does in not matter, since pip ignores them, and this is what makes pip fast compared to conda (implication: people pin dependencies but without cause, so it works even if they are not resolved? is it very important (snce pip can't handle them and will fail with a first-match algorithm? If the second, which that SO answer implies, why don't we see it more often?)

[bast]

My problematic old pip was 20.2.3. Problem disappeared with 21.0.1.

[bast]

After this I added this line to my ve alias: https://github.com/bast/config/blob/63eaa8cdfa85c6e7f68213ba70300511b0d6d992/omf/init.fish#L46