Python 如何用“是”或“否”问题限制用户输入

我正在制作一个游戏，它要求用户回答一个问题。这个问题是肯定还是否定的：

---

我有这个，但我需要这样做，以便用户只能输入是或否。在循环时使用

。当他们键入有效响应时中断循环，否则重复

print("Lying on the ground next to you is a stone slab.")
while True:
    pick = input("Do you pick up the slab? Yes/No ").lower()
    if pick == 'yes':
        print("You pick up the slab and begin reading.")
        break
    elif pick == 'no':
        print("You walk forwards and land facefirst onto the slab.")
        break
    else:
        print("You have to choose Yes or No")

您可以将输入转换为单个案例，这样就不必重复
yes
和
yes
的测试，您可以通过这种方式来完成

print("Lying on the ground next to you is a stone slab.")
pick = input("Do you pick up the slab? Yes/No ")
print(" ")
if pick=="yes":
    print("You pick up the slab and begin reading.")
elif pick=="no":
    print("Lying on the ground next to you is a stone slab.")
else:
  print("Answer Must Be 'Yes' or 'No'")

您可以使用to循环，直到得到“是”或“否”

while True:
    try:
        pick = input("Do you pick up the slab? Yes/No ").lower()
        print(" ")
        if pick != "yes" && pick != "no":
            raise IncorrectInput()
        else:
            #something
        break
    except IncorrectInput():
        print("please input yes or no")


使用
while
循环检查输入是否符合规则，否则要求用户重新输入

print("Lying on the ground next to you is a stone slab.")

while True:
    pick = input("Do you pick up the slab? Yes/No \n> ")
    pick = pick.lower().strip() 
    if pick == "yes" or pick ==  "y" :
        print("You pick up the slab and begin reading.")
        break
    elif pick =="no" or pick == "n": 
        print("You walk forwards and fall facefirst onto the slab.")
        break
    else:
        print("Please input Yes/No.")

如果要提示用户直到输入有效，可以使用循环：

print("Lying on the ground next to you is a stone slab.")
while True:
    pick = input("Do you pick up the slab? Yes/No ").lower() # This will make the user input not case-senitive

    try:
        if pick == "yes":
            print("You pick up the slab and begin reading.")
        elif pick == "no":
            print("Lying on the ground next to you is a stone slab.")
        else:
            raise Exception("Invalid input! Answer Must Be 'Yes' or 'No'")

    except Exception as e:
        print(e)
    
    else:
        break

print("Lying on the ground next to you is a stone slab.")
while True:
    pick = input("Do you pick up the slab? Yes/No ").lower() # This will make the user input not case-senitive

    try:
        if pick == "yes":
            print("You pick up the slab and begin reading.")
        elif pick == "no":
            print("Lying on the ground next to you is a stone slab.")
        else:
            raise Exception("Invalid input! Answer Must Be 'Yes' or 'No'")

    except Exception as e:
        print(e)
    
    else:
        break