decorators.py

from datetime import datetime

DEBUG = True
TIMER = True

def logger(func):
    import sys
    def inner(*args, **kwargs):
        sys.stdout.write("[{}] Calling FNAME with args: {} | kwargs: {}\n".format(datetime.now(), 
                                                                                  args, 
                                                                                  kwargs))
        res = func(*args, **kwargs)
        sys.stdout.write("[{}] Result info: type::{}, value::{}\n".format(datetime.now(), 
                                                                          type(res), 
                                                                          res))
        return res
    return inner if DEBUG else func


def timer(func):
    from datetime import datetime
    def inner(*args, **kwargs):
        t1 = datetime.now()
        res = func(*args, **kwargs)
        t2 = datetime.now()
        c = t2 - t1
        import sys
        sys.stdout.write("[{}] Execution time: {}S : {}m\n".format(datetime.now(), 
                                                                   c.seconds, 
                                                                   c.microseconds))
        return res
    return inner if TIMER else func

@timer
def dummy_func(n: int, reverse: bool = True) -> int:
    a = 0
    for _ in range(n):
        a += 1
    return int(str(a)[::-1]) if reverse else a

@logger
def foo(bar, baz=0, beer=True):
    return "{} {} под окном {}\n".format(baz, bar, "хуй" if beer else "Лёша")

dummy_func(100000000)

print(foo("мох", baz=0.5))


@logger
@timer
def fact(n):
    if n <= 1:
        return n
    else:
        return n * fact(n-1)


fact(150)