python 继承的小例子，使用子类的key

inherit.py

#coding: utf-8

class Base(object):

    def __init__(self):
        print 'Base __init__'

    def update(self):
        print 'Base update'

    @classmethod
    def add(cls):
        print 'Base add'


class C1(Base):
    KEY = 'C1-KEY'

    def __init__(self):
        print 'C1 init'
        super(C1, self).__init__()

    def update(self):
        print 'C1 update'
        self.clear()
        super(C1, self).update()

    @classmethod
    def add(cls):
        print 'C1 add'
        cls.clear()
        super(C1, cls).add()

    @classmethod
    def clear(cls):
        print cls
        print cls.KEY
        print cls.__name__


class C2(C1):
    KEY = 'C2-KEY'


def main():
    c1 = C1()
    print '**' * 10, 'c1 update'
    c1.update()
    print '**' * 10, 'c1 add'
    C1.add()

    c2 = C2()
    print '**' * 10, 'c2 update'
    c2.update()
    print '**' * 10, 'c2 add'
    C2.add()


if __name__ == "__main__":
    main()