num1 = float(input("ввелите 1 число:"))
num2 = float(input("ввелите 2 число:"))
operator = (input("введите знак:+,*,-,/:"))
if operator == "+":
    result = num1 + num2
    print(result)
elif operator == "*":
    result = num1 * num2
    print(result)
elif operator == "-":
    result = num1 - num2
    print(result)
elif operator == "/":
    result = num1 / num2
    print(result)
else:
    print("ошибка")