装饰器与函数多层嵌套

# coding: utf-8
def login(func):
    print("the first level")
    def inner1(*args,**kwargs):
        print("the second level")
        def inner2(*args):
            print("the third level")
            func(*args)
        func(*args)
        return inner2
    return inner1

# @login相当于 tv = login(tv) ,把 tv 函数的内存地址传给login的参数 func ，login函数返回其内部函数 inner1 的内存地址 给tv 。
#当执行tv函数 的时候，其实是执行了login的 inner1 函数。 即 login 原来的参数 func 指向 tv ； tv 指向 inner1 。
@login 
def tv(name,password):
    print("Welcome [%s] [%s] to TV page" % (name,password) )

@login   
def movie(name):
    print("Welcome [%s] to movie page" % name)

@login
def picture(name,password,type):
    print("Welcome [%s] [%s] to picture type [%s]" %(name,password,type))

print(tv)
tv = tv("zhou","123")
print(tv)
tv = tv("zhouding","123456")
print(tv)

movie("Durant")
picture("kobe bryant","kobe123","nature")

　　输出结果：

the first level
the first level
the first level
<function login.<locals>.inner1 at 0x02F34150>
the second level
Welcome [zhou] [123] to TV page
<function login.<locals>.inner1.<locals>.inner2 at 0x02F34300>
the third level
Welcome [zhouding] [123456] to TV page
None
the second level
Welcome [Durant] to movie page
the second level
Welcome [kobe bryant] [kobe123] to picture type [nature]

 

注：函数的*args 参数可以接收一个或者多个参数。