[issue9951] introduce bytes.hex method (also for bytearray and memoryview)

[Roundup Robot]

Roundup Robot added the comment:

New changeset 955a479b31a8 by Gregory P. Smith in branch 'default':
Issue9951: update _hashopenssl and md5module to use _Py_strhex().
https://hg.python.org/cpython/rev/955a479b31a8

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<http://bugs.python.org/issue9951>
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