浅析装饰器的那些事儿

def run():   print('我会跑')fun()

def outer(fun):   def inner():      fun()  //fun是外层函数的变量，在inner里面用   return inner //inner就是里层函数的引用

def func(fun):   def add(*args,**kwarge):      return fun(*args,**kwargs)   return add

def outer(fun):    def inner(*args, **kwarge):        print("我会唱歌")        return fun(*args, **kwarge)    return inner

方法一：使用@符号+装饰器的名字   把它放在想要装饰函数的上一行即可@outerdef run():   print('我会跑')   run()

方法二：def run():    print('我会跑')
run=outer(run)   #就等价于@outerrun()
最终打印结果是：我会唱歌我会跑

def outer(fun):    a = 1    def inner(*args, **kwarge): # args是一个数组，kwargs一个字典        print(fun.__name__) #打印fun接收的函数的名字        print("我会唱歌")        return fun(*args, **kwarge)    return inner

from functools import wraps
def outer(fun):    @wraps(fun)    def inner(*args, **kwargs):        print(fun.__name__,11111111111)        print("我会唱歌")        return fun(*args, **kwargs)    return inner
@outerdef run():   print('我会跑')    print(run.__name__,6666666)  //输出结果为 run 666666

def subuser_keymanage(view_func):    '''功能是实现用户管理权限的判定'''    def _wrapper_view(request, *args, **kwargs):        user = request.user #一个Customer对象，包含了用户名/密码等信息        customer = user.customer.customer_id #用户的id        select_status = get_curuser_permission(user=user, customer=customer)#调用函数返回的值有两种0和1        if not select_status:#如果返回0表示没有权限，返回错误码            return render_response(request, ErrorCode.FAILED)        return view_func(request, *args, **kwargs)    return _wrapper_view

@subuser_keymanage def generate_subuser_ak_sk(request):    params = json.loads(request.body) #获取卡前端传递的参数    user_id_only = params.get("user_id") #获取用户表示id值    中间代码就忽略了......    return render_response(request, ErrorCode.FAILED)

import loggingdef use_logging(level):    def decorator(func):        def wrapper(*args, **kwargs):            if level == "warn":                logging.warn("%s is running" % func.__name__)            elif level == "info":                logging.info("%s is running" % func.__name__)            return func(*args)        return wrapper
    return decorator
@use_logging(level="warn")def foo(name='foo'):    print("i am %s" % name)
foo()

i am fooWARNING:root:foo is running