[issue5793] Rationalize isdigit / isalpha / tolower / ... uses throughout Python source

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

Also, see _toupper/_tolower in Objects/stringlib/stringdef.h and
Objects/stringobject.c. Those should be rationalized as well.

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<http://bugs.python.org/issue5793>
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