Make os.path.join() first parameter pos-only
#6812
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
srittau
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Jan 4, 2022
AlexWaygood
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As discussed in python#11895, mypy's test suite currently does not pass a mypy self-check when run on Windows. This should hopefully be fixed by python/typeshed#6812, but running a self-check on Windows as part of the CI tests should help avoid this issue in the future. This new CI test should hopefully fail until python#11905 is merged, confirming the diagnosis of the problem that I made in python#11895. Once python#11905 is merged, it should hopefully then pass, allowing this PR to be merged.
JelleZijlstra
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As discussed in #11895, mypy's test suite currently does not pass a mypy self-check when run on Windows. This should hopefully be fixed by python/typeshed#6812, but running a self-check on Windows as part of the CI tests should help avoid this issue in the future.
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I was recently surprised to find that the mypy test suite doesn't pass mypy when run on Windows. This is because
posixpath.join()andntpath.join()have different names for the first parameter.Given that both
posixpathandntpathare undocumented modules -- which only exist to provide platform-specific implementations for theos.pathmodule -- I think it makes sense to make the first parameter positional-only for both functions. The whole point of theos.pathmodule is that you can get path-related functions that will reliably work on all systems. That guarantee goes away if you use a keyword argument for the first parameter ofos.path.join().