code: def release(self):
          
          self.monitor.acquire()
          if self.rwlock < 0:
              self.rwlock = 0
          else:
              self.rwlock -= 1
          wake_writers = self.writers_waiting and self.rwlock == 0
          wake_readers = self.writers_waiting == 0
          self.monitor.release()
          if wake_writers:
              self.writers_ok.acquire()
              self.writers_ok.notify()
              self.writers_ok.release()
          elif wake_readers:
              self.readers_ok.acquire()
              self.readers_ok.notifyAll()
              self.readers_ok.release()
docs: Release a lock, whether read or write.