import holoviews as hv
from holoviews import opts
from holoviews import streams
hv.extension('bokeh')

path = hv.Path([])
freehand = streams.FreehandDraw(source=path, num_objects=3,
                                styles={'line_color': ['red', 'green', 'blue']})

path.opts(
    opts.Path(active_tools=['freehand_draw'], height=400, line_width=10, width=400))

freehand.data

freehand.element