关于json.dumps中的参数详解

import json
import numpy as np


class MyEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, np.ndarray):
            return obj.tolist()
        elif isinstance(obj, bytes):
            return str(obj, encoding='utf-8');
        return json.JSONEncoder.default(self, obj)


dict = {'id': 1, 'title': b'xe7xacxacxe4xb8x80xe7xabxa0 xe7xa7xa6xe7xbexbd'}
dup = json.dumps(dict, cls=MyEncoder, ensure_ascii=False, indent=4)
print(dup)

{
    "id": 1,
    "title": "u7b2cu4e00u7ae0 u79e6u7fbd"
}

TypeError: Object of type bytes is not JSON serializable