我们到底如何在Python中利用“ continue”？

i=0
while (i==0):

    n1=float(input("Enter the first number: \n"))
    n2=float(input("Enter the second number: \n"))
    a=str(input("Choose the operation: \n 1.) + \n 2.) - \n 3.) * \n 4.) / \n 5.) % \n"))
    if(a==1):
        print("The addition of the inputted numbers is ", sum(n1,n2),"\n")
    elif(a==2):
        print("The difference between the inputted numbers is ", diff(n1,n2),"\n")
    elif(a==3):
        print("The multiplication of the inputted numbers is ", product(n1,n2),"\n")
    elif(a==4):
        print("The division of the inputted numbers is ", div(n1,n2),"\n")
    elif(a==5):
        print("The modulus of the inputted numbers is ", modulus(n1,n2),"\n")
    else:
        print("Do you want to quit the calculator?")
        b=int(input("Press 00 for 'Yes' and 11 for 'No'\n"))
        if(b==00):
            break 
        else:
            print("Enter a valid option for the operation number.\nThe calculator is re-starting.")
            continue

这是我的python代码。我已经定义了这里使用的所有功能。

我得到的输出是：

当我在图像中圈出的位置输入正确的操作数字3时，为什么输出没有给出最终的计算答案？为什么它一次又一次地重复相同的循环？

请帮助我。