Method peek

scrapy/squeues.py:54–69

Returns the next object to be returned by :meth:`pop`, but without removing it from the queue. Raises :exc:`NotImplementedError` if the underlying queue class does not implement a ``peek`` method, which is optional for queues.

(self)

            return None

        def peek(self) -> Any | None:
            """Returns the next object to be returned by :meth:`pop`,
            but without removing it from the queue.

            Raises :exc:`NotImplementedError` if the underlying queue class does
            not implement a ``peek`` method, which is optional for queues.
            """
            try:
                s = super().peek()
            except AttributeError as ex:
                raise NotImplementedError(
                    "The underlying queue class does not implement 'peek'"
                ) from ex
            if s:
                return deserialize(s)
            return None

    return SerializableQueue