Python 返回flask端点json/状态代码时出错

我有一个端点，如果请求被scucessfull访问并使代码崩溃，那么该端点可以正常工作，否则不会出现预期的行为

class CarbyID(Resource):
    def get(self, car_id):
        json_return = {'car_id': car_id}
        try:
            res = db_query.read(car_id) #gets the data from the databse
            json_return['data'] = res
            return json_return, 200 if res else json_return, 400
        except:
            return json_return,505

class CarbyID(Resource):
    def get(self, car_id):
        json_return = {'car_id': car_id}
        try:
            res = db_query.read(car_id) #gets the data from the databse
            json_return['data'] = res
            return (json_return, 200) if res else (json_return, 400)
        except:
            return json_return,505

当在数据库中找到车辆id时->确定

当找不到car_id时，res为None，预计返回400，但返回500，错误如下：

  File "\Lib\site-packages\werkzeug\datastructures.py", line 1091, in extend
    for key, value in iterable:
ValueError: too many values to unpack (expected 2)

知道为什么吗？它的结构与json+状态代码相同。

好的，所以：

def hola():
    condition = True
    return 'True',"A" if condition else 'False','B'

def hola():
    condition = True
    return ('True',"A") if condition else ('False','B')

返回'True'，'A'，'B'

我希望返回'True'，'A'

正确的答案是

所以，像这样更改代码

In [7]: def test(): 
   ...:     return (1,2) if False else (3,4) 
In [8]: test()                                                                  
Out[8]: (3, 4)

class CarbyID(Resource):
    def get(self, car_id):
        json_return = {'car_id': car_id}
        try:
            res = db_query.read(car_id) #gets the data from the databse
            json_return['data'] = res
            return (json_return, 200) if res else (json_return, 400)
        except:
            return json_return,505