[issue18738] String formatting (% and str.format) issues with Enum

[Eric V. Smith]

Eric V. Smith added the comment:

On 8/15/2013 8:20 PM, Ethan Furman wrote:
> The characters I list are the justification chars and the digits that would be used to specify the field width.  If 
> those are the only characters given then treat the MixedEnum member as the member string.

But a datetime format string can end in "0", for example.

>>> format(datetime.datetime.now(), '%H:%M:%S.00')
'20:25:27.00'

I think your code would produce the equivalent of:
>>> format(str(datetime.datetime.now()), '%H:%M:%S.00')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Invalid conversion specification

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<http://bugs.python.org/issue18738>
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