html = r'{"code":404,"msg":"\u8be5\u8d44\u6e90\u4e0d\u5b58\u5728"}'
print(html)# {"code":404,"msg":"\u8be5\u8d44\u6e90\u4e0d\u5b58\u5728"}
print(html.encode('utf-8').decode('unicode-escape'))# {"code":404,"msg":"该资源不存在"}