[issue27506] make bytes/bytearray delete a keyword argument

[Xiang Zhang]

Xiang Zhang added the comment:

LGTM. Using b'' instead of the None as the default value of *delete* looks better since it doesn't break backwards compatibility. As for the first argument optional or not, actually it's both okay. You have changed the doc accordingly.

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<http://bugs.python.org/issue27506>
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