python--json模块

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import json   user = [     [1, [         11,         12     ]],     [2, [         21,         22     ]], ] print(user) print(type(user)) json_str = json.dumps(user) print(json_str) print(type(json_str)) new_user = json.loads(json_str) print(new_user) print(type(new_user))   with open("record.json", "w") as f:     json.dump(new_user, f)     print("存入文件完成...")   with open('record.json', 'r') as load_f:     load_list = json.load(load_f)     print('读取文件完成...')   print(load_list) print(type(load_list))