>>>pip install cython --upgrade
>>>pip install ctpwrapper --upgrade

 Traceback (most recent call last):
   File "ctpwrapper/TraderApi.pyx", line 1402, in ctpwrapper.TraderApi.TraderSpi_OnRspQrySettlementInfo
   File "/root/python/futures/trader_main.py", line 149, in OnRspQrySettlementInfo
     print(pSettlementInfo.Content)
   File "/root/python/futures/.venv/lib/python3.9/site-packages/ctpwrapper/base.py", line 28, in __getattribute__
     return value.decode("gbk")
 UnicodeDecodeError: 'gbk' codec can't decode byte 0xd2 in position 499: incomplete multibyte sequence

error_message = ""

def OnRspQryTradingAccount(self, pTradingAccount, pRspInfo, nRequestID, bIsLast):
    print("OnRspQryTradingAccount")
    print("nRequestID:", nRequestID)
    print("bIsLast:", bIsLast)
    print("pRspInfo:", pRspInfo)
    print("pTradingAccount:", pTradingAccount)
    # need to check is last message from the server.
    global error_message
    if not bIsLast:
       error_message+=pRspInfo.ErrorMsg
    else:
       error_message+=pRspInfo.ErrorMsg
       if isinstance(error_message,bytes):
           error_message.decode("gbk")