[Python-Dev] Make _strptime only time.strptime implementation?

[Brett Cannon]

Someone filed a bug report wanting it to be mentioned that most libc
implementations  of strptime don't handle %Z.  Michael asked whether
_strptime was going to become the permanent version of time.strptime or
not.  This was partially discussed back when Guido used his amazing time
machine to make time.strptime use _strptime exclusively for testing
purposes.

I vaguely remember Tim saying he supported moving to _strptime, but I
don't remember Guido having an opinion.  If this is going to happen for
2.3 I would like to know so as to fix the documentation to be better.

-Brett