How to add color-picker in Bokeh?

In this article, we are going to see how to add a color picker widget in bokeh. 

Widgets are the best way to make charts more interactive. We can also add widgets in the Bokeh application to provide the best front-end user visualization. Using widgets we can do many things like update charts, connect to other programmatic functionality.  One of the widgets is the color picker.

Creating a color picker for the line chart in bokeh:

# displaying the chart
from bokeh.io import show
from bokeh.layouts import column

# importing colorpicker model from bokeh
from bokeh.models import ColorPicker

# plotting the figure
from bokeh.plotting import Figure

plot = Figure(x_range=(0, 1), 
              y_range=(0, 1), 
              plot_width=350, 
              plot_height=350)

line = plot.line(x=(0,1), 
                 y=(0,1),
                 color="black", 
                 line_width=4)

picker = ColorPicker(title="Line Color")

picker.js_link('color', 
               line.glyph,
               'line_color')

show(column(plot, picker))

Output:

We plot a line chart with a color picker. Here we have explicitly specifies the line chart color 'black'. The color of the line is by default 'blue' of a line chart. We can choose any color from the color picker and change our line chart color. Here I have chosen green color.