python------修饰器

1. python装饰器
   我目前理解的装饰器就是方便代码编写

• 原始程序

def a_new_decorator(a_func):
    def wrapTheFunction():`在这里插入代码片`
        print("I am doing some boring work before executing a_func()")
        a_func()
        print("I am doing some boring work after executing a_func()")
    return wrapTheFunction
def a_function_requiring_decoration():
    print("I am the function which needs some decoration to remove my foul smell")
a_function_requiring_decoration=a_new_decorator(a_function_requiring_decoration)
a_function_requiring_decoration()

输出
I am doing some boring work before executing a_func()
I am the function which needs some decoration to remove my foul smell
I am doing some boring work after executing a_func()

通过给函数传入一个函数名的参数来完成运行，但是如果这个过程需要重复运行的话，就比较繁琐，因此使用修饰器

• 修饰器改进代码

@a_new_decorator
def a_function_requiring_decoration():
    """Hey you! Decorate me!"""
    print("I am the function which needs some decoration to "
          "remove my foul smell")

a_function_requiring_decoration()

这里的@a_new_decorator就把参数接口暴露出来，然后下边的函数就是被传入的参数。