雖然循環測試

Question

我沒有得到這個Python代碼所需的結果。需要幫忙。

當您輸入滿足條件的字符串時，while循環應該停止。

代碼：

x = input("Enter input: ") 

while (int(x[3]) != 1 or int(x[3]) != 2): 
    print("The fourth character must be a 1 or 2") 
    x = input("Enter input again: ") 

Answer 1

一個數量總是不等於1或2，您可能需要使用and：使用not in

x = input("Enter input: ") 

while int(x[3]) != 1 and int(x[3]) != 2: 
    print("The fourth character must be a 1 or 2") 
    x = input("Enter input again: ") 

是更具可讀性：

x = input("Enter input: ") 

while int(x[3]) not in (1, 2): 
    print("The fourth character must be a 1 or 2") 
    x = input("Enter input again: ") 

如果您想要更容錯的方式，請與字符串比較：

while True: 
    x = input("Enter input: ") 
    if x[3:4] in ('1', '2'): 
     break 
    print("The fourth character must be a 1 or 2.")