py.user added the comment:
changed iter(arg) to *arg
>>> import itertools
>>>
>>> class A(itertools.chain):
... @classmethod
... def from_iter(cls, arg):
... return cls(*arg)
...
>>> class B(A):
... pass
...
>>> B('ab', 'cd')
<__main__.B object at 0x7fc280e93cd0>
>>> b = B.from_iter(['ab', 'cd'])
>>> b
<__main__.B object at 0x7fc280e93d20>
>>> next(b)
'a'
>>> next(b)
'b'
>>> next(b)
'c'
>>> next(b)
'd'
>>> next(b)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
StopIteration
>>>
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18301>
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