[issue12014] str.format parses replacement field incorrectly

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

Note also that the nested expansion is only allowed in the format_spec part, per the documentation. Your last examples are attempting to do it in the field_name, which leads to the errors you see. Your very last example doesn't look right to me. I'll have to investigate why it's giving you that error message.

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<http://bugs.python.org/issue12014>
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