_strptime.py 文件源码

def __calc_timezone(self):
        # Set self.timezone by using time.tzname.
        # Do not worry about possibility of time.tzname[0] == time.tzname[1]
        # and time.daylight; handle that in strptime.
        try:
            time.tzset()
        except AttributeError:
            pass
        self.tzname = time.tzname
        self.daylight = time.daylight
        no_saving = frozenset(["utc", "gmt", self.tzname[0].lower()])
        if self.daylight:
            has_saving = frozenset([self.tzname[1].lower()])
        else:
            has_saving = frozenset()
        self.timezone = (no_saving, has_saving)