309     if tz is not None and not isinstance(tz, tzinfo):
953 class tzinfo:  class
981         if dt.tzinfo is not self:
1021 _tzinfo_class = tzinfo
1048     def __new__(cls, hour=0, minute=0, second=0, microsecond=0, tzinfo=None, *, fold=0):  argument
1066         _check_tzinfo_arg(tzinfo)
1072         self._tzinfo = tzinfo
1099     def tzinfo(self):  member in time
1304                 tzinfo=True, *, fold=None):  argument
1314         if tzinfo is True:
1315             tzinfo = self.tzinfo
1318         return time(hour, minute, second, microsecond, tzinfo, fold=fold)
1335     def __setstate(self, string, tzinfo):  argument
1336         if tzinfo is not None and not isinstance(tzinfo, _tzinfo_class):
1346         self._tzinfo = tzinfo
1369                 microsecond=0, tzinfo=None, *, fold=0):  argument
1379         _check_tzinfo_arg(tzinfo)
1388         self._tzinfo = tzinfo
1415     def tzinfo(self):  member in datetime
1487     def combine(cls, date, time, tzinfo=True):  argument
1493         if tzinfo is True:
1494             tzinfo = time.tzinfo
1497                    tzinfo, fold=time.fold)
1578                 minute=None, second=None, microsecond=None, tzinfo=True,  argument
1595         if tzinfo is True:
1596             tzinfo = self.tzinfo
1600                           microsecond, tzinfo, fold=fold)
1603         if self.tzinfo is None:
1624         elif not isinstance(tz, tzinfo):
1627         mytz = self.tzinfo
1638         utc = (self - myoffset).replace(tzinfo=tz)
1850                                          tzinfo=self._tzinfo))
1911     def __setstate(self, string, tzinfo):  argument
1912         if tzinfo is not None and not isinstance(tzinfo, _tzinfo_class):
1924         self._tzinfo = tzinfo
1949 class timezone(tzinfo):
1974         self = tzinfo.__new__(cls)
2038             if dt.tzinfo is not self:
2064 _EPOCH = datetime(1970, 1, 1, tzinfo=timezone.utc)