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

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Please go ahead and finish this. I'm glad this is going in!

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message_count: 16.0 -> 17.0
nosy: +gvanrossum
nosy_count: 6.0 -> 7.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5237>
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