Showing where to put the source

source.py

class PlotLoop(object):
    def __init__(self):
        self.data = Data('data_source_file')
        self.source = ColumnDataSource(data=dict(xs=np.random.rand(50, 2).tolist(), ys=np.random.rand(50, 2).tolist()))
        self.init_plot()

    def init_plot(self):
        """ Initialize the plot with data from self.data
        """

        plot = Plot(title=None,
                    plot_width=600,
                    plot_height=600,
                    min_border=0,
                    toolbar_location=None)

        glyph = MultiLine(xs="xs", ys="ys", line_color="#8073ac", line_width=0.1)
        plot.add_glyph(source, glyph)

        xaxis = LinearAxis()
        plot.add_layout(xaxis, 'below')

        yaxis = LinearAxis()
        plot.add_layout(yaxis, 'left')

        plot.add_layout(Grid(dimension=0, ticker=xaxis.ticker))
        plot.add_layout(Grid(dimension=1, ticker=yaxis.ticker))
        curdoc().add_root(plot)

    def update(self):
        self.source.data = self.data.update()


loop = PlotLoop()
curdoc().add_periodic_callback(loop.update, 100)