[issue39430] tarfile.open(mode="r") race condition when importing lzma

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

It's covered in the language reference where import semantics are explained. It isn't explicitly called out in higher-level docs that I'm aware of because it only really comes up in edge cases like importing in a thread which we actively discourage unless there's a compelling reason not to.

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<https://bugs.python.org/issue39430>
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