Fix IsADirectoryError for namespace packages when using --linecoverage-report #20109
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A regression test for the internal crash python#18128.
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
sterliakov
approved these changes
Oct 24, 2025
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Fixes #18128. This fixes an Internal Error where namespace packages were not supported properly. This fix was inspired by @sterliakov noticing that this bug was very similar to #19843, which has a similar fix. Note that we use
os.path.isdir(tree.path)instead of trying to catch anIsADirectoryErrorexception because of a bug on Windows which causes it to throw aPermissionErrorinstead in the relevant situation, which makesexcept IsADirectoryErrorunreliable. (We also can't justexcept (IsADirectoryError, PermissionError)because what if there is an actual permission error?) Anyway, we just early-return — which, based on my manual testing and reading the code, seems to be the right thing to do here.