2133         class MyElement(ET.Element):  class
2136         mye = MyElement('foo')
2138         self.assertIsInstance(mye, MyElement)
2146         class MyElement(ET.Element):  class
2148                 super(MyElement, self).__init__(tag + '__', attrib, **extra)
2150         mye = MyElement('foo', {'a': 1, 'b': 2}, c=3, d=4)
2156         class MyElement(ET.Element):  class
2160         mye = MyElement('joe')
2164         class MyElement(ET.Element):  class
2169         sub = MyElement('bar')
2561         class MyElement(ET.Element):  class
2563         self._check_element_factory_class(MyElement)
2574         class MyElement(base, ValueError):  class
2576         self._check_element_factory_class(MyElement)