calculator.py

def calculate():
    import adder

    print("Input a number     ")
    d = input()
    d = int (d)

    print("Input a number     ")
    e = input()
    e = int (e)

    f = adder.add(d,e)

    print("So", d, "plus", e, "is")
    print(f)
    return(f)

if __name__ == ("__main__"):
    calculate()