Ronald Oussoren added the comment:

Create a class with a __getitem__ method but no __iter__:

class Seq (object):
    def __len__(self):
        return 5

    def __getitem__(self, idx):
        if idx > len(self):
            raise IndexError(idx)
        return idx * 2


i = iter(Seq())

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nosy: +ronaldoussoren

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17932>
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