setEquality.py

from unittest import TestCase

class Anything:
    def __eq__(self, other):
        return True

    def __ne__(self, other):
        return False

    def __hash__(self):
        class __AnyInt(int):
            def __eq__(self, other):
                return True

            def __ne__(self, other):
                return False

        return __AnyInt()


class EventsTest(TestCase):
    def test__anyInt_matches_any_int(self):
        self.assertFalse(Anything() is Anything())
        self.assertEqual(Anything().__hash__(), 2)
        self.assertEqual(Anything().__hash__(), 3)
        self.assertTrue(isinstance(Anything().__hash__(), int))
        self.assertTrue(isinstance(self.__hash__(), int))
        self.assertEqual("two", Anything())
        self.assertEqual("two".__hash__(), Anything().__hash__())

    def test_sets_containing_underscores(self):
        self.assertIn("two", [Anything()])
        self.assertIn("two", {Anything()})
        self.assertEqual({"one", "two"}, {"one", Anything()})