Class C1

Lib/test/datetimetester.py:4440–4443

    def test_tzinfo_classes(self):
        cls = self.theclass
        class C1(tzinfo):
            def utcoffset(self, dt): return None
            def dst(self, dt): return None
            def tzname(self, dt): return None
        for t in (cls(1, 1, 1),
                  cls(1, 1, 1, tzinfo=None),
                  cls(1, 1, 1, tzinfo=C1())):