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

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Terry covered how to document the feature in his original description of
the proposal. After the phrase "either the numeric
index of a positional argument, or the name of a keyword argument." in
the docs, add a sentence along the lines of the following:

  "If the index/name is left out for all replacement fields, then the
sequential values 0, 1, ... will be automatically inserted."

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message_count: 20.0 -> 21.0

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