[issue1496] add str.maketrans()

[Guido van Rossum]

Guido van Rossum added the comment:

Looks good from a functionality POV.

I wonder if we couldn't change the dict though to always map ordinals to
strings?  Deletions can be mapped to "".  We could warn about non-string
values in the 2.6 version of this code, and make it a (lazy) error in 3.0.

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