Working in the Notebook¶
To display Bokeh plots inline in an Jupyter/Zeppelin notebook, use the
output_notebook() function from bokeh.io instead of (or in addition to)
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:
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.
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.
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
- Next, create some plots, and make sure to pass
- Looking at the handle, see that it is associated with the output cell
Inthat 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
Inhas changed (without being re-executed)
More detailed demonstrations of using notebook handles can be found in the following example notebooks:
It is possible to drive updates to Bokeh plots using Jupyter notebook widgets,
known as interactors. The key doing this is the
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: