python学习第十篇——while 的灵活运用 

 1 sandwiches_orders = ['apple','banana','mango',"apple","watermelon"]
 2 finished_sandwiches = []
 3 while "apple" in sandwiches_orders:
 4         sandwiches_orders.remove("apple")
 5 print("sorry ,The apple is sold out!/nyour ordered are:")
 6 print(sandwiches_orders)
 7 while sandwiches_orders:
 8     print("please wait for a moment,i'm making "+sandwiches_orders[0]+" for you.")
 9     finished_sandwiches.append(sandwiches_orders[0])
10     del sandwiches_orders[0]
11 print("your ordered are finished:")
12 for sandwiche in finished_sandwiches:
13     print("\t"+str(sandwiche))

上述代码的功能是：检查sandwiches_orders列表中是否有"apple"，如果有，则删除apple，打印剩余的水果，并将其逐个添加到finished_sandwiches中，并将其在sandwiches_orders中删除，需要注意的是，这里先打印谁，就先添加谁,更加符合实际点餐先来先到的情况。所以没有采用.pop（）类

posted @ 2018-08-14 15:29  少年π  阅读(223)  评论(0)  编辑  收藏  举报