Python: How to get data from linked brushes in mlpd3, Bokeh, Plotly?

You can get the selected data from a Plotly chart by using Plotly's new Dash framework.

There is an example in the docs here under "Graph Crossfiltering" https://plot.ly/dash/getting-started-part-2

I've pasted the full example below just for preservation of history.

In each of the callbacks below, you have access to the either the selected points, the points that you just hovered over, or the points that you just clicked on. This app simply displays the values of the points in the app, but you could do anything with the points (e.g. compute something else).

import dash
from dash.dependencies import Input, Output
import dash_core_components as dcc
import dash_html_components as html
import json

app = dash.Dash(__name__)

app.layout = html.Div([
    dcc.Graph(
        id='basic-interactions',
        figure={
            'data': [
                {
                    'x': [1, 2, 3, 4],
                    'y': [4, 1, 3, 5],
                    'text': ['a', 'b', 'c', 'd'],
                    'customdata': ['c.a', 'c.b', 'c.c', 'c.d'],
                    'name': 'Trace 1',
                    'mode': 'markers',
                    'marker': {'size': 12}
                },
                {
                    'x': [1, 2, 3, 4],
                    'y': [9, 4, 1, 4],
                    'text': ['w', 'x', 'y', 'z'],
                    'customdata': ['c.w', 'c.x', 'c.y', 'c.z'],
                    'name': 'Trace 2',
                    'mode': 'markers',
                    'marker': {'size': 12}
                }
            ]
        }
    ),

    html.Div([
        dcc.Markdown("""
            **Hover Data**

            Mouse over values in the graph.
        """.replace('   ', '')),
        html.Pre(id='hover-data')
    ], style=styles['column']),

    html.Div([
        dcc.Markdown("""
            **Click Data**

            Click on points in the graph.
        """.replace('    ', '')),
        html.Pre(id='click-data'),
    ], style=styles['column']),

    html.Div([
        dcc.Markdown("""
            **Selection Data**

            Choose the lasso or rectangle tool in the graph's menu
            bar and then select points in the graph.
        """.replace('    ', '')),
        html.Pre(id='selected-data'),
    ])
])


@app.callback(
    Output('hover-data', 'children'),
    [Input('basic-interactions', 'hoverData')])
def display_hover_data(hoverData):
    #
    # This is where you can access the hover data
    # This function will get called automatically when you hover over points
    # hoverData will be equal to an object with that data
    # You can compute something off of this data, and return it to the front-end UI
    # 


    return json.dumps(hoverData, indent=2)


@app.callback(
    Output('click-data', 'children'),
    [Input('basic-interactions', 'clickData')])
def display_click_data(clickData):
    # Similarly for data when you click on a point
    return json.dumps(clickData, indent=2)


@app.callback(
    Output('selected-data', 'children'),
    [Input('basic-interactions', 'selectedData')])
def display_selected_data(selectedData):
    # Similarly for data when you select a region
    return json.dumps(selectedData, indent=2)


if __name__ == '__main__':
    app.run_server(debug=True)