如何在Bokeh中按下按钮时更改数据帧？

from bokeh.plotting import figure, curdoc
from bokeh.layouts import column
from bokeh.models import Button
from bokeh.io import show

data = {'x': [1, 2, 3, 4, 5], 'y': [6, 7, 8, 7, 6]}

p = figure(plot_width=400, plot_height=400)
p.line('x', 'y', source=data)

def change_data():
    new_data = {'x': [1, 2, 3, 4, 5], 'y': [10, 9, 8, 9, 10]}
    source.data = new_data

button = Button(label="Change Data")
button.on_click(change_data)

layout = column(p, button)

curdoc().add_root(layout)

show(layout)