Bokeh default selected dot

bokeh_default_select.ipynb

import numpy as np
from bokeh.plotting import figure
from bokeh.models import ColumnDataSource
from bokeh.io import output_notebook, show

# prepare some date
N = 300
x = np.linspace(0, 4*np.pi, N)
y0 = np.sin(x)

# NEW: create a column data source for the plots to share
source = ColumnDataSource(data=dict(x=x, y0=y0),
                          selected={'0d': {'glyph': None, 'indices': []},
                                    '1d': {'indices': [N/2]},
                                    '2d': {}})

TOOLS = "tap"

# create a new plot and add a renderer
p = figure(tools=TOOLS, width=350, height=350, title=None)
c = p.circle('x', 'y0', source=source)

# show the results
show(p)