python 函数装饰器

发布时间：2020-12-20 12:57:57 所属栏目：Python 来源：网络整理

导读：举个例子 def a_decorator(func): def wrapTheFunc(): print " before decorator " func() print " end decorator " return wrapTheFunc@a_decorator def a_func_need_decorator(): print " In a_func_need_decorator() " a_func_need_decorator() 输出 befo

举个例子

def a_decorator(func):
    def wrapTheFunc():
        print "before decorator"
        func()
        print "end decorator"

    return wrapTheFunc


@a_decorator
def a_func_need_decorator():
    print "In a_func_need_decorator()"


a_func_need_decorator()

输出

before decorator
In a_func_need_decorator()
end decorator

等价

不是很明白？?

@a_decorator?

def a_func_need_decorator():

等价于

a_func_need_decorator = a_decorator(a_func_need_decorator)

修改下代码

def a_decorator(func):
    def wrapTheFunc():
        print "before decorator"
        func()
        print "end decorator"

    return wrapTheFunc


def a_func_need_decorator():
    print "In a_func_need_decorator()"


a_func_need_decorator = a_decorator(a_func_need_decorator)
a_func_need_decorator()

结果是一致的

什么？函数还可以作为对象传输

是的，举例

def test(a):
    print a


test2 = test
test2("hello")

输出

hello

场景

账号验证

日志

参考

https://www.runoob.com/w3cnote/python-func-decorators.html

（编辑：李大同）

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