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def say_hello():
  print("hello")

>>> say_hello()
hello

>>> x=say_hello

>>> x()
hello

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def logging(f):
    def wrapper(*args, **kwargs):
        print("starting!")
        retval = f(*args, **kwargs)
        print("Done!")
        return retval
    return wrapper

say_hello = logging(say_hello)

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@logging
def say_hello():
    print("hello")
    
say_hello("bob")

=== Output ====
starting!
hello bob!
Done!

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from timeit import default_timer as timer
from datetime import timedelta

from functools import cache

def timefunc(f):
    def wrapper(*a, **kw):
        start = timer()
        retval = f(*a, **kw)
        end = timer()

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uncached
--------------------------------------------
(40,) => 165580141 (0:00:22.154210 elasped)
(40,) => 165580141 (0:00:22.521894 elasped)
(40,) => 165580141 (0:00:22.835792 elasped)
--------------------------------------------
(42,) => 433494437 (0:00:58.653067 elasped)
(42,) => 433494437 (0:01:00.355664 elasped)
(42,) => 433494437 (0:01:00.526576 elasped)
--------------------------------------------