A deque can have a fixed length, and its elements are mutable. https://docs.python.org/3.6/library/collections.html#collections.deque https://docs.python.org/3

A deque can have a fixed length, and its elements are mutable. https://docs.python.org/3.6/library/collections.html#collections.deque https://docs.python.org/3.6/library/collections.html#collect...