code: def release(self):
          
  
          me = currentThread()
          self.__condition.acquire()
          try:
              if self.__writer is me:
                  # We are the writer, take one nesting depth away.
                  self.__writercount -= 1
                  if not self.__writercount:
                      # No more write locks; take our writer position away and
                      # notify waiters of the new circumstances.
                      self.__writer = None
                      self.__condition.notifyAll()
              elif me in self.__readers:
                  # We are a reader currently, take one nesting depth away.
                  self.__readers[me] -= 1
                  if not self.__readers[me]:
                      # No more read locks, take our reader position away.
                      del self.__readers[me]
                      if not self.__readers:
                          # No more readers, notify waiters of the new
                          # circumstances.
                          self.__condition.notifyAll()
              else:
                  raise ValueError("Trying to release unheld lock")
          finally:
              self.__condition.release()
docs: Release the currently held lock.
  
          In case the current thread holds no lock, a ValueError is thrown.