First steps 7: Displaying and exporting#
In the previous first steps guides, you created, customized, and combined visualizations.
In this section, you will use various methods to display and export your visualizations.
Creating a standalone HTML file#
All examples so far have used the
show() function to save your visualization to
an HTML file. This HTML file contains all the necessary information to display
To customize the file Bokeh creates for your visualization, import and call the
output_file() accepts various file-related
arguments. For example:
filename: the filename for the HTML file
title: the title for you document (to be used in the HTML’s
If you don’t use the
output_file() function to define a custom file name,
Bokeh defaults to using the file name of the currently running Python script for
the filename of the HTML output. If a script filename is not available (for
instance, in a Jupyter notebook), then Bokeh will generate a random filename.
Bokeh creates the HTML file when you call the
show() function. This function
also automatically opens a web browser to display the HTML file.
If you want Bokeh to only generate the file but not open it in a web browser,
save() function instead.
from bokeh.plotting import figure, output_file, save # prepare some data x = [1, 2, 3, 4, 5] y = [4, 5, 5, 7, 2] # set output to static HTML file output_file(filename="custom_filename.html", title="Static HTML file") # create a new plot with a specific size p = figure(sizing_mode="stretch_width", max_width=500, height=250) # add a circle renderer circle = p.circle(x, y, fill_color="red", size=15) # save the results to a file save(p)
For more information on embedding Bokeh visualizations online, see Web pages in the user guide.
Displaying in a Jupyter notebook#
Exporting PNG files#
To export PNG or SVG files, you might need to install additional dependencies.
In order to create PNG and SVG files, Bokeh uses Selenium. Selenium allows Bokeh to run in a browser without a graphical user interface. Bokeh uses this browser to render the PNG or SVG files. In order for this to work, Selenium needs to be able to access either a Firefox browser (through the geckodriver package) or a Chrome/Chromium browser (through the chromedriver package).
Use this command to install Selenium with geckodriver and Firefox in a conda environment:
conda install selenium geckodriver firefox -c conda-forge
See Additional dependencies for more options to install the required packages.
Once the requirements are installed, you can use the
export_png() function to export your plot into a PNG file:
from bokeh.io import export_png from bokeh.plotting import figure # prepare some data x = [1, 2, 3, 4, 5] y = [4, 5, 5, 7, 2] # create a new plot with fixed dimensions p = figure(width=350, height=250) # add a circle renderer circle = p.circle(x, y, fill_color="red", size=15) # save the results to a file export_png(p, filename="plot.png")
For information on how to export PNG and SVG files, see PNG and SVG export in the user guide.