类方法，实例方法，静态方法，@property的应用

class test(object):

    h = 'hello'
    w = 'world'

    def demo(self):
        print("demo")

    def test_class(self):
        print(test().hello())

    @classmethod
    def hello(cls):
        print(cls.h)

    @property
    def test(self):
        return  1

    @staticmethod
    def read():
        print ('hello world!!!')

    @classmethod
    def write(cls):
        print(cls.h + cls.w)
        s = cls.test
        print (type(s))

f = test()
print (f.test)
f.read()
f.write()
f.test_class()