while 循环回到程序的开头

Question

我正在尝试创建一个循环以使用户回到程序的开头。我无法让它打印“欢迎使用比较功能”。程序将运行，要求用户输入 1 和 2，然后打印比较的答案，但我不知道如何让它重新开始。

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

这将替代您在 Python 3 中的函数：

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) :"))

希望这会有所帮助。谢谢