python之如果输入错误的答案，如何再次询问字符串

如果答案是错误的，我试图让一个字符串继续重复。我该怎么做呢？我的代码在下面，它可以工作但不会重复答案。

print("Hello there, what is your name?") 
MyName = input() 
print ("Nice to meet you " + MyName) 
print ("What is 2 + 2?") 
 
answer = input() 
if answer is '4': 
    print("Great job!") 
elif answer != '4': 
    print ("Nope! please try again.") 
while answer != '4': 
    print ("What is 2 + 2?") 
    break 

请您参考如下方法:

您的代码有几处错误。首先，您目前只要求一次答案。您需要将 answer = input() 放入 while 循环中。其次，您需要使用 == 而不是 is:

print("Hello there, what is your name?") 
MyName = input() 
print ("Nice to meet you " + MyName) 
print ("What is 2 + 2?") 
 
answer = 0 
 
while answer != '4': 
 
    answer = input() 
    if answer == '4': 
        print("Great job!") 
    else: 
        print ("Nope! please try again.") 

您可以通过多种方式安排此代码。这只是其中之一