Class V

Lib/test/test_xml_etree.py:3071–3074

    def test_ass_subscr_with_mutating_iterable_value(self):
        class V:
            def __iter__(self):
                e.clear()
                return iter([ET.Element('a'), ET.Element('b')])

        e = ET.Element('elem')
        e.extend([ET.Element(f'c{i}') for i in range(10)])