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.
Eric.
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