415     if tz is not None and not isinstance(tz, tzinfo):
1114 class tzinfo:  class
1142         if dt.tzinfo is not self:
1212 _tzinfo_class = tzinfo
1239     def __new__(cls, hour=0, minute=0, second=0, microsecond=0, tzinfo=None, *, fold=0):  argument
1267         _check_tzinfo_arg(tzinfo)
1273         self._tzinfo = tzinfo
1300     def tzinfo(self):  member in time
1506                 tzinfo=True, *, fold=None):  argument
1516         if tzinfo is True:
1517             tzinfo = self.tzinfo
1520         return type(self)(hour, minute, second, microsecond, tzinfo, fold=fold)
1537     def __setstate(self, string, tzinfo):  argument
1538         if tzinfo is not None and not isinstance(tzinfo, _tzinfo_class):
1548         self._tzinfo = tzinfo
1572                 microsecond=0, tzinfo=None, *, fold=0):  argument
1592         _check_tzinfo_arg(tzinfo)
1601         self._tzinfo = tzinfo
1628     def tzinfo(self):  member in datetime
1708     def combine(cls, date, time, tzinfo=True):  argument
1714         if tzinfo is True:
1715             tzinfo = time.tzinfo
1718                    tzinfo, fold=time.fold)
1824                 minute=None, second=None, microsecond=None, tzinfo=True,  argument
1841         if tzinfo is True:
1842             tzinfo = self.tzinfo
1846                           microsecond, tzinfo, fold=fold)
1849         if self.tzinfo is None:
1863         elif not isinstance(tz, tzinfo):
1866         mytz = self.tzinfo
1873                 mytz = self.replace(tzinfo=None)._local_timezone()
1880         utc = (self - myoffset).replace(tzinfo=tz)
2085                                            tzinfo=self._tzinfo))
2146     def __setstate(self, string, tzinfo):  argument
2147         if tzinfo is not None and not isinstance(tzinfo, _tzinfo_class):
2159         self._tzinfo = tzinfo
2185 class timezone(tzinfo):
2207         self = tzinfo.__new__(cls)
2271             if dt.tzinfo is not self:
2307 _EPOCH = datetime(1970, 1, 1, tzinfo=timezone.utc)