def removeReader(self, reader):
        """
        Remove a Selectable for notification of data available to read.
        """
        if self._continuousPolling.isReading(reader):
            self._continuousPolling.removeReader(reader)
            return
        self._remove(reader, self._reads, self._writes, self._selectables,
                     EPOLLIN, EPOLLOUT)

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