[issue9951] introduce bytes.hex method

[HCT]

HCT added the comment:

would be good if we can specify a optional flag to get all cap hex. currently, I have to do hexlify( some_bytes ).decode( 'UTF-8' ).upper(). would be good to be able to do some_bytes.hex( upper=1 )

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nosy: +hct

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9951>
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