Calculator in python!

print("""Operations:
* : Multiplcations
/ : divide
- :subctract
+ : add.""")
operator = input("Please enter an operation: ")
num1 = float(input("Please enter the first number: "))
num2 = float(input("Please enter the first second: "))
if operator == "*":
    print("Result: ", num1 * num2)
elif operator == "/":
    print("Result: ", num1 / num2)
elif operator == "-":
    print("Result: ", num1 - num2)
elif operator == "+":
    print("Result: ", num1 + num2)
else:
    print("Invaild operator! please try again.")