def removeWriter(self, writer):
        """
        Implement L{IReactorFDSet.removeWriter}.
        """
        wasLost = False
        try:
            fd = writer.fileno()
        except:
            fd = -1
        if fd == -1:
            for fd, fdes in self._selectables.items():
                if writer is fdes:
                    wasLost = True
                    break
            else:
                return
        if fd in self._writes:
            self._writes.remove(fd)
            if fd not in self._reads:
                del self._selectables[fd]
            if not wasLost:
                try:
                    self._updateRegistration(fd, KQ_FILTER_WRITE, KQ_EV_DELETE)
                except __HOLE__:
                    pass
dataset/ETHPy150Open twisted/twisted/twisted/internet/kqreactor.py/KQueueReactor.removeWriter