from random import random, randint, choice

def our_decorator(func):
    def function_wrapper(*args, **kwargs):
        print("Before calling " + func.__name__)
        res = func(*args, **kwargs)
        print(res)
        print("After calling " + func.__name__)
    return function_wrapper

for f in [random, randint, choice]:
    f = our_decorator(f)

random()
randint(3, 8)
choice([4, 5, 6])

Before calling random
<random_value>
After calling random
Before calling randint
<random_integer>
After calling randint
Before calling choice
<random_choice>
After calling choice

<random_choice among 4,5 6>