cython

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def call_iter1(x):
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    """
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    >>> [ i for i in iter([1,2,3]) ]
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    [1, 2, 3]
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    >>> [ i for i in call_iter1([1,2,3]) ]
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    [1, 2, 3]
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    """
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    return iter(x)
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class Ints(object):
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    def __init__(self):
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        self.i = 0
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    def __call__(self):
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        self.i += 1
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        if self.i > 10:
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            raise ValueError
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        return self.i
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def call_iter2(x, sentinel):
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    """
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    >>> [ i for i in iter(Ints(), 3) ]
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    [1, 2]
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    >>> [ i for i in call_iter2(Ints(), 3) ]
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    [1, 2]
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    """
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    return iter(x, sentinel)
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