Question

我正在为一个类项目设计一个RPG，对一个项目的花哨想法进行工作，该项目可以配置为给现有类提供某些奖励。

但出于某种原因，让While循环正确循环并且不重复print("invalid choice")以便让函数本身工作，这些都超出了我的意义。

感谢任何帮助!!

#PowerTreadFunction
def askPowerTread():
    choice = none
    while choice not in ['A','B','C']:
        print("Invalid choice.")
    choice = input("""Your Power Treads offer the following configurations which each                give distinct bonuses, choose now:\n    
 a) DAMAGE\nb) DEFENSE\nc) ARMOR CLASS\n""")


    if choice == 'A':
        printSlow("Configuring Power Treads for Damage, you now recieve a +5 damage bonus")
        player[DAM] += 5

    elif choice == 'B':
         printSlow("Configuring Power Treads for Defense, you now recieve a +5 defense bonus")
         player[DEF] +=5

    elif choice == 'C':
         printSlow("Configuring Power Treads for Armor Class, you now recieve a +5 armor class bonus")
         player[AC] +=5

Answer 1

你的问题是缩进：

def askPowerTread():
    choice = None
    while choice not in ['A','B','C']:
        print("Invalid choice.")
    choice = input(...)

这里你循环遍历print语句，但没有要求做出新的选择，这是在while块之外。

def askPowerTread():
    choice = None
    while choice not in ['A','B','C']:
        print("Invalid choice.")
        choice = input(...)

应该解决你的问题。一旦解决了，你粘贴的代码看起来很好。

编辑：@IanAuld，你是对的，要解决这个问题：

PROMPT="""\
 Your Power Treads offer the following configurations which each
 give distinct bonuses, choose now:
  a) DAMAGE
  b) DEFENSE
  c) ARMOR CLASS

“”“

def askPowerTread():
    choice = input(PROMPT)
    while choice not in ['A','B','C']:
        print("Invalid choice.")
        choice = input(PROMPT)

Answer 2

#PowerTreadFunction
def askPowerTread():
    choice = none
    while choice not in ['A','B','C']:
        print("Invalid choice.")
    choice = input("""Your Power Treads offer the following configurations which each                give distinct bonuses, choose now:\n    
 a) DAMAGE\nb) DEFENSE\nc) ARMOR CLASS\n""")

您将选择分配给none（我认为您的意思是None），然后输入循环而不更改它。

choice = input(...)在while循环之外，因此永远不会执行。尝试：

def askPowerTread():
        while True:
            choice = input(...)
            if choice in [...]:
                break
            else:
                print('{choice} is an invalid choice'.format(choice=choice))

要展示none和None之间的差异：

>>> type(none)
Traceback (most recent call last):
  File "<pyshell#2>", line 1, in <module>
    type(none)
NameError: name 'none' is not defined
>>> type(None)
<class 'NoneType'>
>>>

寻找帮助在Python中设计While循环

2 个答案: