Include Python version in pip cache key #303
Merged
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Description:
Like we do for pipenv, let's include the Python version in the pip cache key.
Without it, PyPy jobs continually build wheels from source, which is slow, and they never make it into the pip cache because there are prebuilt wheels for CPython jobs already in the cache.
Related issue:
Fixes #288.
Fixes #304.
Check list: