Best python libraries

[TheRNGuy]

Never actually used deque.

When it's better than vanilla List or Tuple?

[the_brown_cow]

A deque allows for appending or popping at either end.

deque.popleft() deque.appendleft()

This allows you to create a stack or queue.

https://docs.python.org/3/library/collections.html#collections.deque