code: def prioritize(self, item, force=False):
          
          with self.condition:
              # If the job is already running (or about to be forced),
              # there is nothing to be done.
              if item in self.working or item in self.force:
                  return
              self.queue.remove(item)
              if force:
                  self.force.append(item)
              else:
                  self.queue.appendleft(item)
              self.condition.notify_all()
docs: Moves the item to the very left of the queue.