Method extend

scrapy/utils/python.py:308–309

(self, *iterables: Iterable[_T])

        self.data: Iterator[_T] = chain.from_iterable(args)

    def extend(self, *iterables: Iterable[_T]) -> None:
        self.data = chain(self.data, chain.from_iterable(iterables))

    def __iter__(self) -> Iterator[_T]:
        return self