Python的 - 虽然声明不生产时虚假陈述

-1

things = ["shorts", "pen", "pencil"] 
userthings = input("what do you want to find?") 
userthings = userthings.lower() 
bagged = False 
for i in things: 
    if i == userthings: 
     bagged = True 

if bagged == True: 
    print ("I has thing") 
else: 
    print ("I dont has thing")   

morestuff = input("Do you want to add anything else?") 
morestuff = morestuff.lower() 

while (morestuff == "yes" or "y"): 
    stuff = input("What do you want to add?") 
    str(stuff) 
    things.append(stuff) 
    print ("I have the following things:", things) 
    morestuff = input("Do you want to add anything else?") 
else: 
    print ("Lol bye")

我的问题是while语句代码，当我输入“无”到morestuff，或任何其他比"yes"或"y"未打印"Lol bye"但与进行stuff = input("What do you want to add?")声明并进入无限循环。Python的 - 虽然声明不生产时虚假陈述

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2015-11-23 Panda God

原因你的错误是，Python看到'morestuff == “是” 或 “y”'为'（morestuff == “是”）或（“y”）'。除非你输入“yes”，否则'（morestuff ==“yes”）'会评估为'False'，而你留下'False'或'y''，评估为''y''。当'“y”'被视为布尔值时，它的计算结果为'True'。如果输入“yes”，则“True”或“y”也会评估为“True”。所以你的循环将永远持续下去。 – Galax

即使你尝试过'morestuff ==（“yes”或“y”）这样的东西，它仍然不能正常工作，因为“yes”或“y”评估为“yes”所以只有输入“yes”才会让你的代码继续。 – Galax

y将始终评估为True并且意味着您的循环永不结束。相反，做

while (morestuff == "yes" or morestuff == "y"):

以上惯用

while (morestuff in ("y", "yes")):

来源

2015-11-23 23:18:27

谢谢！非常有帮助 –

Python的 - 虽然声明不生产时虚假陈述

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