bug

[ScriptingNub]

Good (for the time being )afternoon!

So i would like some help fixing this (probably) easy script - as my user suggests im a scripting nub... (was learning LUA)

kind regards,
ScriptingNub

def add(num1, num2):
    return num1 + num2

def div(num1, num2):
     return num1 / num2
        
def tim(num1, num2):
    return num1 * num2

def subt(num1, num2):
    return num1 - num2




def main():
    validinput = False

    while validinput == False:
        
        try:
            num1 = int(input("what is the first number"))
            num2 = int(input("what is the second number"))
            operation = input("what is the sign")
            validinput = True
            return()



    if (operation == "+"):
        print("adding")
        print(add(num1, num2))
        
    elif (operation == "-"):
        print("subtracting")
        print(subt(num1, num2))
        
    elif (operation == "*"):
        print("multiplying")
        print(tim(num1, num2))
        
    elif (operation == "/"):
        print("dividing")
        print(div(num1, num2))
      
    elif():
        print("operation not understood!")

main()

(also if you have any suggestions please let me know :D)