Filter the files to run pytype tests on by stdlib/VERSIONS file. This
becomes important for Python 3.12, where e.g. checking asynchat.pyi
requires asyncore.pyi, both of which have been removed in 3.12.
Some fairly subtle logic was added in #9408, and I'm immediately regretting not having documented it slightly better. This PR adds some more comments to make maintaining this code easier in the future.
The approach is pretty similar to the approach I took in #9382 for regr_test.py: dynamically create virtual environments for testing stubs packages in isolation. However, since mypy_test.py tests all of typeshed's stubs in succession (and since lots of typeshed's stubs packages depend on other typeshed stubs packages), the performance issues with creating a virtual environment for testing each stubs package are even more severe than with regr_test.py.
I mitigate the performance issues associated with dynamically creating virtual environments in two ways:
- Dynamically creating venvs is mostly slow due to I/O bottlenecks. Creating the virtual environments can be sped up dramatically by creating them concurrently in a threadpool. The same goes for pip installing the requirements into the venvs -- though unfortunately, we have to use pip with --no-cache-dir, as the pip cache gets easily corrupted if you try to do concurrent reads and writes to the pip cache.
- If types-pycocotools requires numpy>=1 and types-D3DShot also requires numpy>=1 (for example), there's no need to create 2 virtual environments. The same requirements have been specified, so they can share a virtual environment between them. This means we don't have to create nearly so many virtual environments.
This major version bump of the stubs package deletes google/__init__.py, which does not exist at runtime, and caused problems for several users. Mypy now has --namespace-packages enabled by default, which should hopefully mean that this causes minimal pain.
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Alex Waygood