在python中使用print（）時，raw write（）返回無效的長度：OSError: raw write() returned invalid length 254 (should have been between 0 and 127)
寫出一個不是code的bug,很煩惱，解決了挺長時間，都翻到外文來看，不過還是解決了，只嘗試了一種簡單可觀的方法，希望對大家有用
即使我想把print()註釋掉，也時不時的蹦出來,錯誤如下：
複製代碼
Traceback (most recent call last):
File "D:\AI\Python35\lib\site-packages\django\core\handlers\exception.py", line 35, in inner
response = get_response(request)
File "D:\AI\Python35\lib\site-packages\django\core\handlers\base.py", line 128, in _get_response
response = self.process_exception_by_middleware(e, request)
File "D:\AI\Python35\lib\site-packages\django\core\handlers\base.py", line 126, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "E:\PyCharmWork\PythonWebApp\ApiPicDjangoSite\PicWeb\views.py", line 94, in trainPic
bankTrain.Cnn_bank_run(lineData,linefile)
File "E:\PyCharmWork\PythonWebApp\ApiPicDjangoSite\PicWeb\Cnn_Bank_train.py", line 70, in Cnn_bank_run
modelTrain.modelTrain_ByType(kwargs[1],X_train,Y_train,X_test,Y_test)
File "E:\PyCharmWork\PythonWebApp\ApiPicDjangoSite\PicWeb\trainModel_init.py", line 113, in modelTrain_ByType
verbose=1, validation_data=(kwgs[3], kwgs[4]))
File "D:\AI\Python35\lib\site-packages\keras\models.py", line 960, in fit
validation_steps=validation_steps)
File "D:\AI\Python35\lib\site-packages\keras\engine\training.py", line 1650, in fit
validation_steps=validation_steps)
File "D:\AI\Python35\lib\site-packages\keras\engine\training.py", line 1233, in _fit_loop
callbacks.on_epoch_end(epoch, epoch_logs)
File "D:\AI\Python35\lib\site-packages\keras\callbacks.py", line 73, in on_epoch_end
callback.on_epoch_end(epoch, logs)
File "D:\AI\Python35\lib\site-packages\keras\callbacks.py", line 306, in on_epoch_end
self.progbar.update(self.seen, self.log_values, force=True)
File "D:\AI\Python35\lib\site-packages\keras\utils\generic_utils.py", line 369, in update
sys.stdout.write(info)
OSError: raw write() returned invalid length 254 (should have been between 0 and 127)
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錯誤都很有規律可循：
Error like this：
OSError: raw write() returned invalid length 318 (should have been between 0 and 159)
OSError: raw write() returned invalid length 8 (should have been between 0 and 4)
OSError: raw write() returned invalid length 130(should have been between 0 and 65)
Please note： 318=159x2 8=4x2 130=65x2
原因：可能與最近的Windows 10更新有關。我有版本1709（操作系統版本16299.64）,
我認爲這可能是unicode字符的返回值（正常長度的兩倍）？
我實際上可以在外部powershell.exe中重現此錯誤，所以這本身不是Code相關的。
總的來說，與win10系統、版本有關係，踩中雷區了（本人win10,版本 10.0.16299 版本 16299）
可以cmd一下,輸入msinfo32，就能看到版本情況
解決方案：寫入以下代碼到報錯提示的python的中，寫在開頭
事先要看你是否pip install win_unicode_console,沒有，就趕快動手
import win_unicode_console
win_unicode_console.enable()
如下：
參考：https://github.com/Microsoft/vscode/issues/39149