Working in the Notebook¶

Inline Plots¶

To display Bokeh plots inline in an Jupyter/Zeppelin notebook, use the output_notebook() function from bokeh.io instead of (or in addition to) the output_file() function we have seen previously. No other modifications are required. When show() is called, the plot will be displayed inline in the next notebook output cell. You can see a Jupyter screenshot below:

By defaults, output_notebook() apply to Juypter. If you want to use bokeh to display inline plots in Zeppelin, you need to specify notebook_type to zeppelin in output_notebook(). Here’s one Zeppelin screenshot.

Notebook Slides¶

It is possible to use the Jupyter notebook in conjunction with Reveal.js to generate slideshows from notebook cell content. It is also possible to include standalone (i.e. non-server) Bokeh plots in such sideshows, however some steps must be followed for output to correctly display. Primarily:

The cell containing output_notebook must not be skipped.

The rendered cell output of the output_notebook call is responsible for making sure the BokehJS library is loaded. Without that, Bokeh plots cannot function. If this cell type is marked “skip” then BokehJS will not be loaded, and Bokeh plots will not display. An alternative, if you wish to hide this cell, is to mark it as the “notes” slide type.

Notebook Handles¶

It is possible to update a previously shown plot in-place. When the argument notebook_handle=True is passed to show() then a handle object is returned. This handle object can be used with the push_notebook() function to update the plot with any recent changes to plots properties, data source values, etc. But notebook handle is only supported in Jupyter, not supported by Zeppelin yet.

The following screenshots walk through the basic usage of notebook handles.

• First, import standard functions, as well as push_notebook():

• Next, create some plots, and make sure to pass notebook_handle=True to show():

• Looking at the handle, see that it is associated with the output cell for In[2] that was just displayed:

• Now, update any properties of the plot, then call push_notebook() with the handle:

• After doing so, note that the earlier output cell for In[2] has changed (without being re-executed)

More detailed demonstrations of using notebook handles can be found in the following example notebooks:

• examples/howto/notebook_comms/Basic Usage.ipynb
• examples/howto/notebook_comms/Jupyter Interactors.ipynb

Jupyter Interactors¶

It is possible to drive updates to Bokeh plots using Jupyter notebook widgets, known as interactors. The key doing this is the push_notebook() function described above. Typically it is called in the update callback for the interactors, to update the plot from widget values. A screenshot of the examples/howto/notebook_comms/Jupyter Interactors.ipynb example notebook is shown below: