Remove and return an item from the queue without blocking.

        Return an item if one is immediately available, else raise
        `QueueEmpty`.

def get_nowait(self) -> _T:
        """Remove and return an item from the queue without blocking.

        Return an item if one is immediately available, else raise
        `QueueEmpty`.
        """
        self._consume_expired()
        if self._putters:
            assert self.full(), "queue not full, why are putters waiting?"
            item, putter = self._putters.popleft()
            self.__put_internal(item)
            future_set_result_unless_cancelled(putter, None)
            return self._get()
        elif self.qsize():
            return self._get()
        else:
            raise QueueEmpty