deque
Also written: collections.deque, popleft, double-ended queue
A Python list-like container from `collections` that is fast at both ends. BFS uses it as a queue, with `popleft()` taking the oldest item from the front.
Also written: collections.deque, popleft, double-ended queue
A Python list-like container from `collections` that is fast at both ends. BFS uses it as a queue, with `popleft()` taking the oldest item from the front.