code: def contains_key(self, key):
          
          check_not_none(key, "key can't be None")
          key_data = self._to_data(key)
          return self._encode_invoke_on_key(replicated_map_contains_key_codec, key_data, key=key_data)
docs: Determines whether this map contains an entry with the key.
  
          **Warning: This method uses __hash__ and __eq__ methods of binary form of the key, not the actual implementations
          of __hash__ and __eq__ defined in key's class.**
  
          :param key: (object), the specified key.
          :return: (bool), ``true`` if this map contains an entry for the specified key.