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

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

Brett:
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> 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.

When was this change made?  Assuming it is, in fact, a change.  It seems like most of the stdlib could be called in a thread, so the practice of lazily importing a module wholesale might need to be audited and proactively fixed.  Maybe that could be a newcomer's easy(ish) project?

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