[issue22939] integer overflow in iterator object

[STINNER Victor]

STINNER Victor added the comment:

I prefer to raise an OverflowError *before* calling
PySequence_GetItem(). The call to PySequence_GetItem() may be
expensive, and we have to drop the result if an OverflowError is
raised after the call. At the end, the behaviour is the same: an
OverflowError is raised.

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<http://bugs.python.org/issue22939>
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