class Person(object):
    @staticmethod
    def person_speak(obj):
        print('I like Hiphop!')

me = Person()
me.person_speak(me)
Person.person_speak(me)

# I like Hiphop! 
# I like Hiphop! 

class Person(object):
    sex = 'man'
    def __init__(self, sex):
        self.sex = sex
    # @classmethod
    def hello(self):
        print('I am {}'.format(self.sex))

me = Person('woman')
me.hello()

# I am woman
# 去掉装饰器的注释后，输出
# I am man