bokeh Getting started with bokeh Hello World

Example

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.