Class Indexable

Lib/test/test_struct.py:285–290

                # to pack as integers.  That is assuming the implemented
                # '__index__' method returns an 'int'.
                class Indexable(object):
                    def __init__(self, value):
                        self._value = value

                    def __index__(self):
                        return self._value

                # If the '__index__' method raises a type error, then
                # '__int__' should be used with a deprecation warning.