while循環回到程序開始

Question

我正在嘗試創建一個循環，以使用戶回到程序的開頭。 我無法打印“歡迎使用比較功能”。 該程序將運行，要求用戶輸入1和2，然后將打印比較的答案，但是我不知道如何重新開始。

def comparison():
    loop = True
    while (loop):
        print(" Welcome to the comparison function")
    a = int (input("Enter your first number for value a, then hit enter key:"))
    b = int (input("Enter your second number for value b, then hit enter key:"))
    def compare (a,b):
        if a>b:
            return 1
        elif a==b:
            return 0
        else:
            return -1
    answer = compare(a,b)
    print (answer)
    while True:
    response=input ("Would you like to perform another comparison? (yes/no)")
    if response=="yes" or response =="YES" or response =="Yes":
        print ("Thank you!")
        break
    elif response=="no" or response=="NO" or response =="No":
        loop=False
        print ("Thank you, have a great day!")
        break
    else:
        continue

Answer 1

這將取代Python 3中的函數：

def comparison():
    while True:
        print("Welcome to the comparison function")
        a = int(input("Enter your first number for value a, then hit enter key:"))
        b = int(input("Enter your second number for value b, then hit enter key:"))

        # Recommended replacement for cmp(a, b) in Python 3
        # https://docs.python.org/3.0/whatsnew/3.0.html#ordering-comparisons
        answer = (a > b) - (a < b) 
        print(answer)

        response = input("Would you like to perform another comparison? (yes/no)")
        while response.lower() not in ['yes', 'no']:
            response = input("please enter proper response: ")

        if response.lower() == "yes":
            print("Thank you!")
        else:
            print("Thank you, have a great day!")
            break

comparison()

Answer 2

def comparision():
    loop = True
    while loop:
            print ("welcome to the comparision function: ")
            a = int(input(("Enter your number for a value a , then hit enter key:")))
            b = int (input("Enter your second number for value b, then hit enter key:"))
            answer = ''
            if a > b:
                answer = 1
            elif a == b:
                answer = 0
            else:
                answer = -1
            print (answer)
            response = str(input("Would you like to perform another comparison? (yes/no) :"))

            while response.lower() not in ['yes', 'no']:
                response = str(input("please enter proper response: "))

            if response.lower() == 'yes'
                continue
            elif response.lower() == 'no' 
                print ("Thank you, have a great day!")
                break

if __name__ == '__main__':
    comparision()

如果您使用的是python 2.7：

response = str(raw_input("Would you like to perform another comparison? (yes/no) :"))

希望這可以幫助。 謝謝