python 装饰器详解与应用范例

# fun1为装饰器名称，function指的是被装饰的函数
def fun1(function):
	def fun2():
		print("开始了！")
		function() # 执行被装饰的函数或者 或者 return function()
	return fun2

@fun1
def fun3():
	print("aaa")

fun3()

def fun3():
	print("aaa")
fun = fun1(fun3)
fun()

def fun1(function):
	def fun2(a):
		print("开始了！")
		function(a) 
	return fun2

@fun1
def fun3(a):
	print(a)
fun3("aaa")

def fun1(function):
	def fun2(*args, **kwargs):
		print("开始了！")
		function(*args, **kwargs) 
	return fun2

@fun1
def fun3(a,b):
	print(a,b)

@fun1	
def fun4(a,b,c):
    print(a,b,c)
    
fun3("aaa","bbb")
fun4("ccc","ddd","eee")

def fun(msg):
	def fun1(function):
		def fun2(*args, **kwargs):
			print("开始了！{}".format(msg))
			function(*args, **kwargs) 
		return fun2
	return fun1

@fun(msg="小朋友")
def fun3(a,b):
	print(a,b)

fun3("aaa","bbb")

class fun1(object):
    def __init__(self, func):
        self.func = func

    def __call__(self, *args, **kwargs):
        print(("开始了！")
        self.func(*args, **kwargs)

@fun1
def fun2(a,b):
	print(a,b)

fun2("aaa","bbb")

class fun(object):
    def __init__(self, msg):
        self.msg = msg
        

    def __call__(self, func):
        def fun1(*args, **kwargs):
            print("开始了！{0}".format(self.msg))
            func(*args, **kwargs)
        return fun1

@fun(msg="小朋友")
def fun2(a, b):
    print(a, b)

fun2("aaa,","bbb")