我怎么不打印两次

Question

I'm new to python and experimenting with functions. Here's the sample code that I'm working wtih

def menu():
    print(" 1. Divide")

def test1(x,y):
    if y == 0:
        return "The result is undefined"
    else:
        return x/y

num1=int(input("First: "))
num2=int(input("Second: "))

menu()
answer=int(input("Choose: "))

while answer != 0:
    if answer == 1:
        print()
        print(" The result is", test1(num1,num2))
    print()
    menu()
    answer=int(input("Choose: "))

When I run the program and input ay value of 0, the result prints twice. How do I make it print once only then return to menu? Thank you

Answer 1

This is not a bug in your code, you can simply Change your zero condition to this:

if y == 0:
    return "undefined"