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

[David W. Lambert]

David W. Lambert <lambertdw at corning.com> added the comment:

Answering first question msg81873.

Without colon separator, this might be considered confusing:

>>> (
...     '{d}{s}{f}{f}'.format(3, 'foo', 3.14, 2.72),
...     '{d}{s}{f}{f}'.format(d=3, s='foo', f=3.14)
... )
('3foo3.1400002.720000', '3foo3.143.14')

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<http://bugs.python.org/issue5237>
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