Serhiy Storchaka added the comment:
There is similar issue on 3.x:
>>> import array
>>> it = iter(array.array('i'))
>>> format(it)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Type arrayiterator doesn't define __format__
>>> type(it).__format__
<method '__format__' of 'object' objects>
>>> format(it)
'<arrayiterator object at 0xb703f4ec>'
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versions: +Python 3.5, Python 3.6
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Python tracker <[email protected]>
<http://bugs.python.org/issue26906>
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