Getting started with bokeh

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Remarks

Bokeh is a Python interactive visualization library that targets modern web browsers for presentation. Its goal is to provide elegant, concise construction of novel graphics in the style of D3.js, and to extend this capability with high-performance interactivity over very large or streaming datasets.

Bokeh can help anyone who would like to quickly and easily create interactive plots, dashboards, and data applications.

Hello World

To use bokeh you need to launch a bokeh server and connect to it using a browser. We will use this example script (hello_world.py ):

from bokeh.models import ColumnDataSource
from bokeh.plotting import figure
from bokeh.io import curdoc

def modify_doc(doc):
    """Add a plotted function to the document.

    Arguments:
        doc: A bokeh document to which elements can be added.
    """
    x_values = range(10)
    y_values = [x ** 2 for x in x_values]
    data_source = ColumnDataSource(data=dict(x=x_values, y=y_values))
    plot = figure(title="f(x) = x^2",
                  tools="crosshair,pan,reset,save,wheel_zoom",)
    plot.line('x', 'y', source=data_source, line_width=3, line_alpha=0.6)
    doc.add_root(plot)
    doc.title = "Hello World"

def main():
    modify_doc(curdoc())
    
main()
 

To launch it you need to execute bokeh on the command line and use the serve command to launch the server:

$ bokeh serve --show hello_world.py
 

The --show parameter tells bokeh to open a browser window and show document defined in hello_world.py .

Installing Bokeh

Bokeh's Docs on Installation

Bokeh runs on Python it has the following dependencies;

NumPy, Jinja2, Six, Requests, Tornado >= 4.0, PyYaml, DateUtil

If you plan on installing with Python 2.7 you will also need future .

All of those come with the Anaconda Python Distribution. Which you can download and install for free.

Once you have anaconda installed onto your machine then you can simply run the following in cmd.exe on Windows or terminal on Mac:

conda install bokeh
 

If you already have a version of Python then you can run the following in cmd.exe on Windows or terminal on Mac:

pip install bokeh
 

Be sure to check out the Bokeh quick start guide for several examples.

Using Bokeh in Jupyter Notebook

Here is a simple example of how to use Bokeh in Jupyter Notebook:

import numpy as np
from bokeh.plotting import figure
# Make Bokeh Push push output to Jupyter Notebook.
from bokeh.io import push_notebook, show, output_notebook
from bokeh.resources import INLINE
output_notebook(resources=INLINE)

# Create some data.
x = np.linspace(0,2*np.pi,20)
y = np.sin(x)

# Create a new plot with a title and axis labels
p = figure(title="Simple Line Plot in Bokeh", x_axis_label='x', y_axis_label='y')

# Add a line renderer with legend and line thickness
p.line(x, y, legend="Value", line_width=3)

# Show the results
show(p)
 

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56 Contributors: 4
Tuesday, April 4, 2017
Licensed under: CC-BY-SA

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