[issue1588] str.format() wrongly formats complex() numbers (Py30a2)

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> I think a ValueError would be best. That way if we decide to give it
> some meaning in the future, we know it won't change any working code.

Agreed.  It also fits with the way that other non-numeric types seem to 
behave, as in:

>>> format("boris", "030s")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: '=' alignment not allowed in string format specifier

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<http://bugs.python.org/issue1588>
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