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

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Unfortunately, `'{d}{s}{f}'.format(3, 'foo', 3.14)` can't work as you
expect it to, because it already means "display the keyword arguments
named `d`, `s` and `f`.

(I agree that the syntax for format() strings is exceedingly tedious)

On the other hand, `'{:d}{:s}{:f}'.format(3, 'foo', 3.14)` should be
possible.

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nosy: +pitrou

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