面向对象小练习

class UserInfo(object):
    pass


class Department(object):
    pass


class StarkConfig(object):

    def __init__(self, num):
        self.num = num

    def get_vals(self):
        v = [11, 22, 33]

        extra = self.extra_vals()
        if extra:                  # 如果extra为真，（None为假） 条件成立
            v.extend(extra)
        return v

    def extra_vals(self):
        pass

    def run(self):
        return self.get_vals()


class RoleConfig(StarkConfig):

    def extra_vals(self):
        return [99, 88]


class AdminSite(object):
    def __init__(self):
        self._registry = {}

    def register(self, k, v):
        self._registry[k] = v(k)


site = AdminSite()
site.register(UserInfo, StarkConfig)
site.register(Department, RoleConfig)
for k, row in site._registry.items():
    print(row.run())