def addWriter(writer):
        """
        I add writer to the set of file descriptors to get write events for.

        @param writer: An L{IWriteDescriptor} provider that will be checked for
                       write events until it is removed from the reactor with
                       L{removeWriter}.

        @return: L{None}.
        """

        I add writer to the set of file descriptors to get write events for.

        @param writer: An L{IWriteDescriptor} provider that will be checked for
                       write events until it is removed from the reactor with
                       L{removeWriter}.

        @return: L{None}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/interfaces.py