test_datetime.py 文件源码

def test_argument_passing(self):
        cls = self.theclass
        # A datetime passes itself on, a time passes None.
        class introspective(tzinfo):
            def tzname(self, dt):    return dt and "real" or "none"
            def utcoffset(self, dt):
                return timedelta(minutes = dt and 42 or -42)
            dst = utcoffset

        obj = cls(1, 2, 3, tzinfo=introspective())

        expected = cls is time and "none" or "real"
        self.assertEqual(obj.tzname(), expected)

        expected = timedelta(minutes=(cls is time and -42 or 42))
        self.assertEqual(obj.utcoffset(), expected)
        self.assertEqual(obj.dst(), expected)