[issue17616] wave.Wave_read and wave.Wave_write can be context managers

[Roundup Robot]

Roundup Robot added the comment:

New changeset 4f3b6eff2ede by R David Murray in branch 'default':
#17616: Improve context manager tests, fix bugs in close method and mode docs.
http://hg.python.org/cpython/rev/4f3b6eff2ede

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<http://bugs.python.org/issue17616>
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