[issue18301] In itertools.chain.from_iterable() there is no cls argument

[py.user]

py.user added the comment:

>>> import itertools
>>> 
>>> class A(itertools.chain):
...     def from_iter(arg):
...         return A(iter(arg))
... 
>>> class B(A):
...     pass
... 
>>> B('a', 'b')
<__main__.B object at 0x7f40116d7730>
>>> B.from_iter(['a', 'b'])
<__main__.A object at 0x7f40116d7780>
>>>

it should be B

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18301>
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