Question

def valid():
    while True:
        hiOrLo = input("Type 'h' for higher and 'l' for lower.")
        if hiOrLo == "h" or hiOrLo == "l":
            return 
        else:
            print("Invalid, try again")

hiOrLo = 0
valid()

print(hiOrLo)

我的理解是Python不会通过＆＃34;输入＆＃34;来改变变量。而在while循环中，所以当打印hiOrLo仍然是＆＃34; 0＆＃34;，但我需要hiOrLo才能成为＆＃34; h＆＃34;或者＆＃34; l＆＃34;，无论我选择哪一个，我如何保持它的功能呢？

Answer 1

让函数返回该值，然后保存对它的引用。

def valid():
    while True:
        hiOrLo = input("Type 'h' for higher and 'l' for lower.")
        if hiOrLo == "h" or hiOrLo == "l":
            return hiOrLo
        else:
            print("Invalid, try again")

hiOrLo = valid()

print(hiOrLo)

Answer 2

您需要全局关键字：

def valid():
    global hiOrLo
    while True:
        hiOrLo = input("Type 'h' for higher and 'l' for lower.")
        if hiOrLo == "h" or hiOrLo == "l":
            return 
        else:
            print("Invalid, try again")

hiOrLo = 0
valid()

print(hiOrLo)

如何使while循环分配变量？

2 个答案: