[issue39717] Fix exception causes in tarfile module

[Vedran Čačić]

Vedran Čačić <vedgar at gmail.com> added the comment:

I guess https://bugs.python.org/issue39728 is a perfect example of "previous exception not adding any value". :-) And I think it isn't a coincidence that it happens in "your" module.

The morale: we think about exceptions in different ways, and it's hard to say what's the right way. Maybe we should just change the wording to imply that __context__ exception didn't spontaneously "occur", but was explicitly "raised" by a handler.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39717>
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