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.

def contains(self, item):
        """
        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.
        """
        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)