python学习之hook钩子的原理和使用

import timeclass LazyPerson(object):  def __init__(self, name):    self.name = name    self.watch_tv_func = None    self.have_dinner_func = None  def get_up(self):    print("%s get up at:%s" % (self.name, time.time()))  def go_to_sleep(self):    print("%s go to sleep at:%s" % (self.name, time.time()))  def register_tv_hook(self, watch_tv_func):    self.watch_tv_func = watch_tv_func  def register_dinner_hook(self, have_dinner_func):    self.have_dinner_func = have_dinner_func  def enjoy_a_lazy_day(self):    # get up    self.get_up()    time.sleep(3)    # watch tv    # check the watch_tv_func(hooked or unhooked)    # hooked    if self.watch_tv_func is not None:      self.watch_tv_func(self.name)    # unhooked    else:      print("no tv to watch")    time.sleep(3)    # have dinner    # check the have_dinner_func(hooked or unhooked)    # hooked    if self.have_dinner_func is not None:      self.have_dinner_func(self.name)    # unhooked    else:      print("nothing to eat at dinner")    time.sleep(3)    self.go_to_sleep()def watch_daydayup(name):  print("%s : The program ---day day up--- is funny!!!" % name)def watch_happyfamily(name):  print("%s : The program ---happy family--- is boring!!!" % name)def eat_meat(name):  print("%s : The meat is nice!!!" % name)def eat_hamburger(name):  print("%s : The hamburger is not so bad!!!" % name)if __name__ == "__main__":  lazy_tom = LazyPerson("Tom")  lazy_jerry = LazyPerson("Jerry")  # register hook  lazy_tom.register_tv_hook(watch_daydayup)  lazy_tom.register_dinner_hook(eat_meat)  lazy_jerry.register_tv_hook(watch_happyfamily)  lazy_jerry.register_dinner_hook(eat_hamburger)  # enjoy a day  lazy_tom.enjoy_a_lazy_day()  lazy_jerry.enjoy_a_lazy_day()

Tom get up at:1509246940.32Tom : The program ---day day up--- is funny!!!Tom : The meat is nice!!!Tom go to sleep at:1509246949.34Jerry get up at:1509246949.34Jerry : The program ---happy family--- is boring!!!Jerry : The hamburger is not so bad!!!Jerry go to sleep at:1509246958.37