我正在用 Python 編寫(xiě)代碼，需要通過(guò) RFID 標(biāo)簽注冊(cè)用戶(hù)并將該記錄寫(xiě)入文件。我設(shè)法編寫(xiě)了一個(gè)運(yùn)行良好的函數(shù)：def register_user(self, rfid):    with open(self._RECORDS_FILE_PATH, 'r') as infile:        recordsData = json.load(infile)    with open(self._RECORDS_FILE_PATH, 'w+') as outfile:        newRecord = {            "timestamp": int(round(time.time() * 1000)),            "rfid": rfid        }        recordsData["recordsList"].insert(0, newRecord)        json.dump(recordsData, outfile)但我想盡可能優(yōu)化代碼，減少行數(shù)。因此，我決定使用它，w+因?yàn)樗鼞?yīng)該能夠同時(shí)讀取和寫(xiě)入文件。這是“優(yōu)化”的代碼：def register_user(self, rfid):    with open(self._RECORDS_FILE_PATH, 'w+') as file:        recordsData = json.load(file)        newRecord = {            "timestamp": int(round(time.time() * 1000)),            "rfid": rfid        }        recordsData["recordsList"].insert(0, newRecord)        json.dump(recordsData, file)“優(yōu)化”代碼不起作用，它給出了這個(gè)錯(cuò)誤：Traceback (most recent call last):  File "/home/pi/accessControl/accessControlClasses/userInfoApi.py", line 57, in register_user_offline    recordsData = json.load(outfile)  File "/usr/lib/python2.7/json/__init__.py", line 291, in load    **kw)  File "/usr/lib/python2.7/json/__init__.py", line 339, in loads    return _default_decoder.decode(s)  File "/usr/lib/python2.7/json/decoder.py", line 364, in decode    obj, end = self.raw_decode(s, idx=_w(s, 0).end())  File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode    raise ValueError("No JSON object could be decoded")ValueError: No JSON object could be decoded將保存記錄的文件：{"recordsList": []}有人能告訴我為什么會(huì)這樣嗎？