Python进阶精华属性可由用户修改的装饰器

　　此章节为代码示例，了解即可，不要求掌握：from functools import wraps,partial import logging  def attach_wrapper(obj,func=None):     if func is None:         return partial(attach_wrapper,obj)     setattr(obj,func.__name__,func)#为包装函数添加访问器函数作为一个属性     return func  def logged(level,name=None,message=None):     def decorate(func):         logname =name if name else func.__module__         log = logging.getLogger(logname)         logmsg = message if message else func.__name__          @wraps(func)         def wrapper(*args,**kwargs):             log.log(level,logmsg)             return func(*args,**kwargs)          @attach_wrapper(wrapper)         def set_level(newlevel):             nonlocal level             level = newlevel          @attach_wrapper(wrapper)         def set_message(newmsg):             nonlocal logmsg             logmsg = newmsg          return wrapper     return decorate  @logged(logging.DEBUG) def add(x:int,y:int):     return x+y  @logged(logging.CRITICAL,＂example＂) def spam():     print(＂Spam!＂)  logging.basicConfig(level=logging.DEBUG) print(add(2 ,3)) add.set_message(＂add called＂) print(add(2 ,3)) add.set_level(logging.WARNING) print(add(2,3))  #结果为： ＂＂＂ DEBUG:__main__:add DEBUG:__main__:add called WARNING:__main__:add called 5 5 5 ＂＂＂
　　我的csdn：https://blog.csdn.net/weixin_43520503
　　我的知乎：https://www.zhihu.com/people/PythonChen007