code: def contains(self, item):
          
          check_not_none(item, "Value can't be None")
          item_data = self._to_data(item)
          return self._encode_invoke(set_contains_codec, value=item_data)
docs: Determines whether this set contains the specified item or not.
  
          :param item: (object), the specified item to be searched.
          :return: (bool), ``true`` if the specified item exists in this set, ``false`` otherwise.