def _remove_writer(self, writer_fd):
    self.loop.remove_writer(writer_fd)
    for reader_fd in self.writers_to_readers.pop(writer_fd):
        self.readers_to_writers.pop(reader_fd)
def _remove_writer(self, writer_fd):
    self.loop.remove_writer(writer_fd)
    for reader_fd in self.writers_to_readers.pop(writer_fd):
        self.readers_to_writers.pop(reader_fd)