Add version trait to Widget base, From widget Trello: version numbers for widget models; when reloaded, will give the widget a chance to do something intelligent or fail (by default) if the version number doesn't match.
Add version trait to Widget base,
From widget Trello: version numbers for widget models;
when reloaded, will give the widget a chance to do
something intelligent or fail (by default) if the
version number doesn't match.

ipython/ipython,ipython/ipython