[issue23479] str.format() breaks object duck typing

[Martin Panter]

Martin Panter added the comment:

My guess is you could make it work by adding a __format__ method to your custom class.

def __format__(self, format_spec):
    return format(float(self), format_spec)

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nosy: +vadmium

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23479>
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