code: def resume_writing(self):
          '''Transport calls when the send buffer has room.'''
          if not self._can_send.is_set():
              self._can_send.set()
              self.transport.resume_reading(f resume_writing(self):
          '''Transport calls when the send buffer has room.'''
          if not self._can_send.is_set():
              self._can_send.set()
              self.transport.resume_reading()
docs: Transport calls when the send buffer has room.