题目给的输出信息不对 注意！！！！！！！！！！
pizza_inventory=['bacon','durian','bacon','bacon','chicken','durian']
while 'bacon' in pizza_inventory :
    pizza_inventory.remove('bacon')
    print('A pastrami order was deleted from list.')
if 'bacon' not in pizza_inventory:
    print('There is really no pastrami in sandwich_orders!')