Adding Widgets

One of the most powerful features of Bokeh is the ability to use widgets to interactively change the data that's displayed in a visualization. To understand the importance of interactivity in your visualizations, imagine seeing a static visualization about stock prices that only shows data for the last year.

If you're interested in seeing the current year or even visually comparing it to the recent and coming years, static plots won't be suitable. You would need to create one plot for every year or even overlay different years on one visualization, which would make it much harder to read.

Comparing this to a simple plot that lets the user select the date range they want, we can already see the advantages. You can guide the user by restricting values and only displaying what you want them to see. Developing a story behind your visualization is very important, and doing this is much easier if the user has ways of interacting with the data.

Bokeh...