simple calculator that I need backed up

#get users input
op = input("Operation: ")
num1 = float(input("First Number:"))
num2 = float(input("Second Number:"))

#define the 5 operation functions
def addition(a, b):
    print(float(num1 + num2))

def subtract(a, b):
    print(float(num1 - num2))

def multiply(a, b):
    print(float(num1 * num2))

def divide(a, b):
    print(float(num1 / num2))

def exponent(a, b):
    print(float(num1 ** num2))

#according to what user input, the operations are printed out accordingly
if op == '+':
    addition(num1, num2)
if op == '-':
    subtract(num1, num2)
if op == '*':
    multiply(num1, num2)
if op == '/':
    divide(num1, num2)
if op == '^':
    exponent(num1, num2)