装饰器2（类装饰器）

1.
class logging(object):
    def __init__(self,level='INFO'):
        self.level=level
    def __call__(self,func):
        def wrapper(*args,**kwargs):
            print "[{level}]:enter {func}()".format(level=self.level,func=func.__name__)
            func(*args,**kwargs)
        return  wrapper

@logging(level='INFO')
def say2(something):
    print "hello {}".format(something)

if __name__=='__main__':
    say2('nihao')

[INFO]:enter say2()
hello nihao

2.
#相当于调用classmethod/staticmethod的__init__方法
class classmethod(object):
    def __init__(self, function):
        pass
class staticmethod(object):
    def __init__(self, function):
        pass

class Test1(object):
    def test1(self):
        print 'object'
    @classmethod
    def test2(cls):
        print 'classmethod'
    @staticmethod
    def test3():
        print 'staticmethod'
a=Test1()
a.test1()
print a.test2
print a.test3

object
<__main__.classmethod object at 0x000000000254D588>
<__main__.staticmethod object at 0x000000000254D5C0>