def removeWriter(self, writer):
        """
        Remove a Selectable for notification of data available to write.
        """
        if self._continuousPolling.isWriting(writer):
            self._continuousPolling.removeWriter(writer)
            return
        self._remove(writer, self._writes, self._reads, self._selectables,
                     EPOLLOUT, EPOLLIN)

        Remove a Selectable for notification of data available to write.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/epollreactor.py