Method _string_to_bytes

Lib/mailbox.py:197–205

(self, message)

        raise NotImplementedError('Method must be implemented by subclass')

    def _string_to_bytes(self, message):
        # If a message is not 7bit clean, we refuse to handle it since it
        # likely came from reading invalid messages in text mode, and that way
        # lies mojibake.
        try:
            return message.encode('ascii')
        except UnicodeError:
            raise ValueError("String input must be ASCII-only; "
                "use bytes or a Message instead")

    # Whether each message must end in a newline
    _append_newline = False