Nick Coghlan <ncogh...@gmail.com> added the comment:

One brief comment on the wording of the error message: the inconsistent naming 
is actually copied from the str.format code.

>>> "{foo} {} {bar}".format(2, foo='fooval', bar='barval')
'fooval 2 barval'
>>> "{foo} {0} {} {bar}".format(2, foo='fooval', bar='barval')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: cannot switch from manual field specification to automatic field 
numbering

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13598>
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