Vajrasky Kok added the comment:
>>> itertools.repeat.__doc__
'repeat(object, times=None)\nReturns an iterator which returns the object the
specified number of times.\n\nIf times is None, returns the object endlessly.'
>>> itertools.repeat('a', times=None)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: __new__() argument 2 must be (unspecified), not None
Also, maybe it's a good idea to add case for None and negative times in
itertools.repeat unit test. You can get inspiration from
http://bugs.python.org/issue19145
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<http://bugs.python.org/issue20341>
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