散景 python 回调以打印新属性值

Question

我正在尝试使用回调获取散景散点图上套索选定点的数据。

我正在研究此处显示的示例：Bokeh Server callback from tools

from bokeh.plotting import figure, curdoc, show, output_file
from bokeh.models import ColumnDataSource
from bokeh.layouts import column
from bokeh.io import curdoc
import pandas as pd
import numpy as np

df = pd.DataFrame(np.random.randint(0,100,size=(100, 2)), columns=list('XY'))

source=ColumnDataSource(df)

p = figure(title="Some Figure", tools=["lasso_select"])

pglyph = p.circle(x='X', y='Y', source=source)

def callback(attr, old, new):
    # The index of the selected glyph is : new['1d']['indices'][0]
    patch_name =  source.data['X'][new['1d']['indices'][0]]
    print("LassoTool callback executed on Patch {}".format(patch_name))


pglyph.data_source.on_change('selected',callback)


curdoc().add_root(column(p))

#bokeh serve --show TestApp.py

使用 Bokeh Server 运行此脚本时，我需要进行哪些更改才能使打印功能正常工作？这将帮助我了解如何访问所选要素的数据以用作另一个图表的来源。

Answer 1

链接的代码已经过时了。使用任何相对较新版本的 Bokeh 执行此操作的正确方法是：

def callback(attr, old, new):
    patch_name =  source.data['X'][new]
    print("LassoTool callback executed on Patch {}".format(patch_name))

pglyph.data_source.selected.on_change('indices',callback)