# importing libraries

import time

import math

# decorator to calculate duration

# taken by any function.

def calculate_time(func):

    # added arguments inside the inner1,

    # if function takes any arguments,

    # can be added like this.

    def inner1(*args, **kwargs):

        # storing time before function execution

        begin = time.time()

        func(*args, **kwargs)

        # storing time after function execution

        end = time.time()

        print("Total time taken in : ", func.__name__, end - begin)

    return inner1

# this can be added to any function present,

# in this case to calculate a factorial

@calculate_time

def factorial(num):

    # sleep 2 seconds because it takes very less time

    # so that you can see the actual difference

    time.sleep(2)

    print(math.factorial(num))

# calling the function.

factorial(10)