类对象与 JSON 串互转疑问

[explist]

import json as js

class test:
def __init__(self,List):
self.a = List

json_str = js.dumps(test(list('abc')),default=lambda obj: obj.a)

test_obj = js.loads(json_str,object_hook=lambda obj : test(obj))

print(type(test_obj)) # 为什么此处结果为list

[socrates]

如文档写到中

object_hook is an optional function that will be called with the result of any object literal decoded (a dict). The return value of object_hook will be used instead of the dict. This feature can be used to implement custom decoders (e.g. JSON-RPC class hinting).

所以，list对象根本不会触发object_hook