[issue5237] Allow auto-numbered replacement fields in str.format() strings

[Eric Smith]

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

Right. The colon would be required if there's a format specifier. Or an
exclamation if there's just a conversion specifier:

"{!r}{:f}{!s:^10}".format('foo', 3, 10)
would give:
"'foo'3.000000    10    "

I've attached a new version that includes format specifiers.

Added file: http://bugs.python.org/file13073/auto_number_formatter_1.py

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