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Wed Mar 11 21:20:17 CET 2009 · https://mail.python.org/pipermail/python-dev/2009-March/087081.html

2009/3/11 Eric Smith <eric at trueblade.com>:
> I'm implementing support for auto-numbering of str.format() fields (see
> http://bugs.python.org/issue5237). I'm reasonably sure that when I'm done
> modifying the C implementation I'll need to change the signatures of
> string.Formatter._vformat, str._formatter_parser, and/or
> str._formatter_field_name_split. (They need to support the state needed to
> track the auto-number field counter.)
>
> I've always considered these internal implementation details of str.format
> and string.Formatter. They begin with underscores and are not documented.
>
> Is there any problem with modifying these in 2.7 and 3.1? I assume not, but
> I want to make sure it doesn't give anyone heartburn.

Certainly sounds fine with me.

-- 
Regards,
Benjamin

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[Python-Dev] Can I modify string.Formatter._vformat?