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

[Eric Smith]

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

The attached file is a mostly working version that inherits from
string.Formatter. It has the following shortcomings, which would all be
addressed if we go forward:

- Doesn't handle escaping '{' or '}'
- Doesn't handle conversion specifiers, like '!s'

These are all a function of me being too lazy to write a complete
parser. If anyone really wants them, I could add them. But this is just
a proof of concept.

Admittedly this isn't a drop-in replacement for ''.format(), but it
should give a taste of what using it would be like.

Added file: http://bugs.python.org/file13067/auto_number_formatter.py

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