Odoo 继承website_sale模块下controllers中的main，重写方法始终掉不起来

[xudalinzhou163.com]

本来是打算重写网站website_sale模块中controllers文件夹中的类方法，但是继承始终不生效，下面重写的方法始终进不去，
有能看出异常的大神吗？

# -- coding: utf-8 --
import dotop
from dotop import http
from dotop.http import request
import dotop.addons.website_sale.controllers.main


class website_sale(dotop.addons.website_sale.controllers.main.website_sale):

    def checkout_values(self, data=None):
        cr, uid, context, registry = request.cr, request.uid, request.context, request.registry
        orm_partner = registry.get('res.partner')
        orm_user = registry.get('res.users')
        orm_country = registry.get('res.country')
        state_orm = registry.get('res.country.state')
        orm_res_branch = registry.get('res.branch')

[qq342406169]

类都还没继承，怎么重写。。。