Chris

Yes, I believe so. One way of saying what I want to do is that I may know that 'f' will be in the test set, but it is not...

Is there a way to detect when a cell is being run from my regular Jupyterlab kernel, versus when it's being run from `jupyter-book build`? I think a temporary shortcut...

Just noting here that according to this announcement, python 2 isn't supported with the current release version of the python kernel, IPython 6 http://blog.jupyter.org/2017/04/19/release-of-ipython-6-0/