老男孩Python运维自动化课程之－－装饰器

• 不带参数的装饰器

  def w1(main_func):
      def outer(*args, **kwargs):
          before_func(*args, **kwargs) ＃before_func定义忽略
  
          main_func(*args, **kwargs)
  
          after_func(*args, **kwargs)  ＃after_func定义忽略
      return outer
  
  @w1
  def show()
      pass
  # 装饰器w1将show作为其第一个参数，并使用返回值重新定义了show

• 带参数的装饰器

  def login(name, password)...
  
  def errorHandler()...
  
  def Filter(before_func, after_func):
      def outer(main_func):
          def wrapper(*args, **kwargs):
              before_result = before_func(*args, **kwargs)
              main_result = main_func(*args, **kwargs)
              after_result = after_func(*args, **kwargs)
      return wrapper
  return outer
  
  @Filter(login, errorHandler)
  def show():
      pass
  
  #先运行一次Filter(login, errorHandler)，用返回值替换自身。然后再运行outer(main_func)