[issue39717] Fix exception causes in tarfile module

[Ethan Furman]

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

Looking back at PEP3134 [1], the 

    raise NewException from exc

is used as one of the examples.


[1] https://www.python.org/dev/peps/pep-3134/#id37

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