On April 19, 2016, we released ipywidgets 5.0. The
Altogether, 17 authors contributed to 205 pull requests to make this release.
This release features several major changes and a myriad of smaller changes and bugfixes.
The main change in this release is the split and refactoring of the old package into two packages:
the Python backend, ipywidgets.
This separation decouples widget display views from language specific kernel operations of a widget. Kernel authors benefit from being able to more easily implement backends for other language kernels, like R, Julia, Ocaml or Haskell, while at the same time using a stable target version of jupyter-js-widgets. We intend to follow the semantic versioning convention for future releases of jupyter-js-widgets. A runtime compatibility check between frontend and backend is also implemented for user convenience.
Another important new feature, use of Jupyter widgets outside of the notebook context, gives new possibilities for information control and display. Live interactive widgets can now be embedded into static web pages or blogs by inserting an html snippet containing the serialized widget state. This also works with custom widget libraries. See http://jupyter.org/embed-jupyter-widgets.html.
Smaller changes in this release include the addition of a new 'selection slider' and making the layout of interactive widgets on the page much easier.
A more detailed document on the changes is available here:https://github.com/ipython/ipywidgets/wiki/ipywidgets-5.0-Release-Document
Using this release of ipywidgets requires a Jupyter notebook 4.2 installation which uses the notebook's new nbextension installation and enabling features. If you have an older version of the notebook and you upgrade ipywidgets, the ipywidgets upgrade will also install for you an updated version of the notebook.
Thank you to the entire Jupyter and IPython team for making this a possibility. An extra big thank you to Sylvain Corlay for working many late hours and weekends to make this happen.