test_tzinfo.py 文件源码

def _roundtrip_datetime(self, dt):
        # Ensure that the tzinfo attached to a datetime instance
        # is identical to the one returned. This is important for
        # DST timezones, as some state is stored in the tzinfo.
        tz = dt.tzinfo
        p = pickle.dumps(dt)
        unpickled_dt = pickle.loads(p)
        unpickled_tz = unpickled_dt.tzinfo
        self.assertTrue(tz is unpickled_tz, '%s did not roundtrip' % tz.zone)