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

[Eric Smith]

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

I'll implement this by adding a pyctype.h and pyctype.c, mimicking
<ctype.h>. I'll essentially copy and rename the methods in
bytes_methods.[ch], then change bytes_methods.h to refer to the new
versions, for backward compatibility.

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assignee:  -> eric.smith

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