avoid installing __pycache__ directories

[minrk]

the current prometheus wheels include __pycache__ directories in their package data files.

[csmarchbanks]

Thanks! When I am testing this out it appears to work for the source distribution, and I am still seeing the various compiled python files added to the wheel. It appears that MANIFEST.in only applies to the source distribution.

I am happy to merge this as it is a definite improvement but do you want to take a stab at that as well? If not I will work on adding some methods for cleaning the repo before building for the next release.

[minrk]

How do you build your wheels? I couldn't find it to test with. I tested with the current standard python3 -m build . and it didn't include any pycache files in sdist or wheel, nor did python3 setup.py bdist_wheel (setuptools 65.6.3). So maybe it's less the manifest and more the release process that's doing it?

[csmarchbanks]

I was testing with python3 setup.py sdist bdist_wheel which I have been using in the past and still seems to add the __pycache__ directories on my machine (if they are present), even on the most recent version of setuptools. However, it looks like using python3 -m build does not include the __pycache__ files so I will move to using that in future releases!