PYTHON“Unicode”对象不支持项赋值

Question

需要帮助，请处理此错误：

类型错误：“unicode”对象不支持项分配

木质素:menuDic[str（menu.id）]['menuDishes'][str（d.dish.dishType.name）]['dishTypeName'][str（d.dish.id）]={}

def getDishOfTheWeek():
    menuDic = Ddict(dict)
    for menu in Menus.select().where(state = True):
        menuDic[str(menu.id)]={}
        menuDic[str(menu.id)]['menuId']=menu.id
        menuDic[str(menu.id)]['menuName']=menu.name
        menuDic[str(menu.id)]['menuCountry']=menu.country.name
        menuDic[str(menu.id)]['menuDishes']={}
        for d in DishMenuRels.select().where(menu = menu.id).join(Dishes).join(DishTypes).order_by('name')
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)] = {}
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'] = d.dish.dishType.name
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'][str(d.dish.id)] = {}
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'][str(d.dish.id)]['dishId'] = d.dish.id
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'][str(d.dish.id)]['dishState'] = d.dish.name
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'][str(d.dish.id)]['dishType'] = d.dish.price
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'][str(d.dish.id)]['dishName'] = d.dish.country.name
    print json.dumps(menuDic, indent=5, sort_keys=True)

谢谢

Answer 1

在这里，您将值d.dish.dishType.name（看起来是一个unicode字符串）分配给字典键'dishTypeName'。

        menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]\
               ['dishTypeName'] = d.dish.dishType.name

然后，对该值使用项赋值；下面的内容与d.dish.dishType.name[str(d.dish.id)] = {}相同。

        menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]\
               ['dishTypeName'][str(d.dish.id)] = {}

不用说，这会导致错误，因为d.dish.dishType.name是一个不可变的字符串。

我可以补充一下，你最好把这些作业分解成小块，也许有几个函数？这些长的赋值语句——我相信您已经注意到了——很难解释和调试。