Python装饰器

不带参数的简单装饰器

def user_test(func):#此处func是bar函数
    def wrapper(*args,**kwargs):
        print("%s is running" %func.__name__)
        return func(*args,**kwargs)
    return wrapper

@user_test
def bar():
    print("i am bar")

bar()

函数带参数的装饰器

def deco(func):
    def _deco(a, b):
        print("before myfunc() called.")
        a += 1
        b += 1
        ret = func(a, b)
        print("after myfunc() called. result: %s" % ret)
        return ret
    return _deco


@deco
def myfunc(a, b):
    print(" myfunc(%s,%s) called." % (a, b))
    return a + b

myfunc(1,2)

带参数的装饰器 ：

def deco(arg):  
    def _deco(func):  
        def __deco():  
            print("before %s called [%s]." % (func.__name__, arg))  
            func()  
            print("  after %s called [%s]." % (func.__name__, arg))  
        return __deco  
    return _deco  
 
@deco("mymodule")  
def myfunc():  
    print(" myfunc() called.")  
 
@deco("module2")  
def myfunc2():  
    print(" myfunc2() called.")  
  
myfunc()  
#这段代码是抄别人的