Python脚本问题：重复提问且输入4时循环无法终止

核心问题分析 #

1. 未处理输入"4"的合法分支，导致输入4时直接进入else触发无限循环
2. 若仅需单次提问，while True循环完全多余；若需要输入错误时重新提问，原代码未在循环内重新获取输入，变量值始终不变

方案1：仅提问一次，输出对应内容 #

去掉冗余循环，补充对"4"的判断逻辑：

def quest2():
    q2 = input("\nWhat's your prefered beverage? \n\t1. Beer \n\t2. Wine \n\t3. Vodka \n\t4. I don't drink alcohol (Answer with: 1, 2, 3 or 4)")
    return q2

variable1 = quest2()

if variable1 == "1":
    print("\nYou went the safe route")
elif variable1 == "2":
    print("\nSomeone has some fine taste")
elif variable1 == "3":
    print("\nYou build your own stuff")
elif variable1 == "4":
    print("\nRespect for your choice!")
else:
    print("\nInvalid input, please enter 1, 2, 3 or 4 next time.")

方案2：输入错误时重新提问，直到输入合法 #

将获取输入的函数调用放入循环内部，确保每次循环更新输入值，同时补充"4"的处理分支：

def quest2():
    q2 = input("\nWhat's your prefered beverage? \n\t1. Beer \n\t2. Wine \n\t3. Vodka \n\t4. I don't drink alcohol (Answer with: 1, 2, 3 or 4)")
    return q2

while True:
    variable1 = quest2()
    if variable1 == "1":
        print("\nYou went the safe route")
        break
    elif variable1 == "2":
        print("\nSomeone has some fine taste")
        break
    elif variable1 == "3":
        print("\nYou build your own stuff")
        break
    elif variable1 == "4":
        print("\nRespect for your choice!")
        break
    else:
        print("\nInvalid input, please try again.")

内容的提问来源于stack exchange，提问作者Tudor Nichita