Serhiy Storchaka added the comment:
What if use _PyObject_HasLen?
if (_PyObject_HasLen(o)) {
res = PyObject_Length(o);
...
}
hint = _PyObject_LookupSpecial(o, &PyId___length_hint__);
...
----------
nosy: +serhiy.storchaka
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<http://bugs.python.org/issue19369>
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