[python] ipython notebook [NotebookApp] WARNING | Unreadable Notebook:.ipynb global name 'NBFormatError' is not defined

[python] ipython notebook  [NotebookApp] WARNING | Unreadable Notebook:.ipynb global name 'NBFormatError' is not defined

使用$  ipython notebook test.ipynb 時出現這樣的錯誤

使用
$ ipython --version
目前還在 2

ipython notebook 3 以後有個 breaking update


$ pip install ipython -U


$ ipython --version
4.0.0

這樣就可以開啟了