class Queue: def __init__(self): self.queue = [] def enqueue(self, item): self.queue.append(item) def dequeue(...

class Stack: def __init__(self): self.stack = [] def push(self, item): self.stack.append(item) def pop(self): ...

import time for i in range(101): bar = '[' + '=' * (i // 2) + ' ' * (50 - i // 2) + ...