tardis.py 文件源码

def __new__(cls, offset, name=_Omitted):
        if not isinstance(offset, timedelta):
            raise TypeError("offset must be a timedelta")
        if name is cls._Omitted:
            if not offset:
                return cls.utc
            name = None
        elif not isinstance(name, str):
            raise TypeError("name must be a string")
        if not cls._minoffset <= offset <= cls._maxoffset:
            raise ValueError("offset must be a timedelta"
                             " strictly between -timedelta(hours=24) and"
                             " timedelta(hours=24).")
        if (offset.microseconds != 0 or
            offset.seconds % 60 != 0):
            raise ValueError("offset must be a timedelta"
                             " representing a whole number of minutes")
        return cls._create(offset, name)