def modeChanged(writeable):
        """
        Indicates that the write status of a mailbox has changed.

        @type writeable: L{bool}
        @param writeable: A true value if write is now allowed, false
            otherwise.
        """

        Indicates that the write status of a mailbox has changed.

        @type writeable: L{bool}
        @param writeable: A true value if write is now allowed, false
            otherwise.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/mail/interfaces.py