解决：TypeError: Object of type ‘bytes‘ is not JSON serializable

 参考:https://blog.csdn.net/qq_41982466/article/details/115716102

json.dumps发现字典中有bytes类型数据，无法解码，要在把这个bytes转换成str就可以

def default(self, obj):

    if isinstance(obj, bytes):

        return str(obj, encoding='utf-8')

    return json.JSONEncoder.default(self, obj)