time.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)