code: def create(self, parties):
          
          assert parties > 0, "parties must be a positive integer."
          return self.backend.add(self.key, parties, self.ttl)
docs: Create the barrier for the given number of parties.
  
          Parameters:
            parties(int): The number of parties to wait for.
  
          Returns:
            bool: Whether or not the new barrier was successfully created.