mailbox.py 文件源码

def get_message(self, key):
        """Return a Message representation or raise a KeyError."""
        start, stop = self._lookup(key)
        self._file.seek(start)
        from_line = self._file.readline().replace(os.linesep, '')
        string = self._file.read(stop - self._file.tell())
        msg = self._message_factory(string.replace(os.linesep, '\n'))
        msg.set_from(from_line[5:])
        return msg