How to recover a notebook emptied after kernel crash?

Question

While working in an ipython notebook, eventually I had to Ctrl+C as the kernel seemed to be halted.

The console gave me a message like:

[NotebookApp] Ker         


        

Answer 1

If none of the above helped, I found a workaround to recover most of the changes I did since the last checkout - by simply calling this command in your notebook:

%history -g

If you want your IPython history in a plain-text file, you can export it yourself.

You can also do it for a specific filename:

%history -g -f filename 

What does -g do? – Without -g it exports the history for the current session. With -g it exports history for all sessions.