test_datetime.py 文件源码

def test_bug_1028306(self):
        # Trying to compare a date to a datetime should act like a mixed-
        # type comparison, despite that datetime is a subclass of date.
        as_date = date.today()
        as_datetime = datetime.combine(as_date, time())
        self.assertTrue(as_date != as_datetime)
        self.assertTrue(as_datetime != as_date)
        self.assertTrue(not as_date == as_datetime)
        self.assertTrue(not as_datetime == as_date)
        self.assertRaises(TypeError, lambda: as_date < as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime < as_date)
        self.assertRaises(TypeError, lambda: as_date <= as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime <= as_date)
        self.assertRaises(TypeError, lambda: as_date > as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime > as_date)
        self.assertRaises(TypeError, lambda: as_date >= as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime >= as_date)

        # Neverthelss, comparison should work with the base-class (date)
        # projection if use of a date method is forced.
        self.assertTrue(as_date.__eq__(as_datetime))
        different_day = (as_date.day + 1) % 20 + 1
        self.assertTrue(not as_date.__eq__(as_datetime.replace(day=
                                                     different_day)))

        # And date should compare with other subclasses of date.  If a
        # subclass wants to stop this, it's up to the subclass to do so.
        date_sc = SubclassDate(as_date.year, as_date.month, as_date.day)
        self.assertEqual(as_date, date_sc)
        self.assertEqual(date_sc, as_date)

        # Ditto for datetimes.
        datetime_sc = SubclassDatetime(as_datetime.year, as_datetime.month,
                                       as_date.day, 0, 0, 0)
        self.assertEqual(as_datetime, datetime_sc)
        self.assertEqual(datetime_sc, as_datetime)