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Wed Feb 23 00:15:08 CET 2011 · https://mail.python.org/pipermail/python-dev/2011-February/108176.html

On Tue, Feb 22, 2011 at 6:01 PM, Steve Holden <steve at holdenweb.com> wrote:
> ... It would appear from tests
> that "{0[X]}".format(...) first tries to convert the string "X" to in
> integer. If it succeeds then __getitem__() is called with the integer as an
> argument, otherwise it is called with the string itself as an argument. Is
> this correct?

This is addressed in the PEP 3101:
"""
    The rules for parsing an item key are very simple.
    If it starts with a digit, then it is treated as a number, otherwise
    it is used as a string.
""" http://www.python.org/dev/peps/pep-3101/

If current implementation does something more involved, I would say it is a bug.

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[Python-Dev] Fwd: deep question re dict as formatting input