Eric Smith <[email protected]> added the comment:
The attached patch (against trunk) changes the message.
However, it has at least one unintended consequence. If you have an
object with no __format__, it gets converted to a string, which is then
formatted. So you get:
>>> '{0:^10}'.format(0j)
' 0j '
>>> '{0:^10x}'.format(0j)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: Unknown presentation type x for str
>>>
I'm calling format on an complex number, but the error says "str". The
error is correct, because the complex number has been converted to a
string before the formatting mechanism can get the actual type. I think
we'll have to live with this if we add the type to the error message.
----------
keywords: +patch
Added file: http://bugs.python.org/file13102/issue5247.patch
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