Functions are objects too

import datetime
import time

class TimedEvent:
    def __init__(self, endtime,callback):
        self.endtime = endtime
        self.callback = callback

    def ready(self):
        return self.endtime <= datetime.datetime.now()


class Timer:
    def __init__(self):
        self.events = []

    def call_after(self,delay,callback):
        end_time = datetime.datetime.now() + datetime.timedelta(seconds=delay)

        self.events.append(TimedEvent(end_time,callback))


    def run(self):
            while True:
                ready_events = (e for e in self.events if e.ready())
                for event in ready_events:
                    event.callback(self)
                    # here callback is a function this means run callback function
                    self.events.remove(event)
                time.sleep(0.5)


def format_time(mes,*args):
    now = datetime.datetime.now().strftime("%I:%M:%S")
    print(mes.format(*args, now=now))


def one(timer):
       format_time("{now}: Called One")
def two(timer):
       format_time("{now}: Called Two")
def three(timer):
       format_time("{now}: Called Three")


timer = Timer()
timer.call_after(1, one)
timer.call_after(2, one)
timer.call_after(2, two)
timer.call_after(8, two)
timer.call_after(3, three)
timer.call_after(6, three)
format_time("{now}: Starting")
timer.run()



def my_function():
    print('The function was called')
my_function.description='Silly'

def second_function():
    print('The second was called')
second_function.descroption = 'Siller'

def another_function(fx):
    print(fx.descroption)
    print('Now call the function')
    fx()

another_function(second_function)



def my_function(a,b):
    print(a+b)
my_function.description='Silly'

def second_function():
    print('The second was called')
second_function.description = 'Siller'

def another_function(fx,*args):
    print(fx.description)
    print('Now call the function')
    fx(*args)

another_function(my_function,1,5)