python - After saving a plotly figure to html file, can you re-read it later as a figure?

Question

I'd like to edit the data, probably adding more traces to the graph. I've found a way to display the html file as a graph, but not to edit it.

from IPython.display import HTML
HTML(filename='file_name.html')

标签： pythonhtmlplotlyfigure

Answer 1

通常Plotly JSON应该用于图表的（反）序列化（例如figure.write_json和plotly.read_json）。但是，如果您只有图表的 HTML 表示形式，则会将相同的 Plotly JSON 提供给plotly.js那里，并且可以将其提取出来。

仅用于演示。plotly==5.1.0用过的。

import json
import re

import plotly.express


def write():
    fig = plotly.express.bar(y=[0, 1, 1, 2, 3, 5, 8, 13, 21, 34])
    fig.write_html('plot.html', full_html=True)
    fig.write_json('plot.json')


def read_from_json():
    return plotly.io.read_json('plot.json')


def read_from_html():
    with open('plot.html') as f:
        html = f.read()
    call_arg_str = re.findall(r'Plotly\.newPlot\((.*)\)', html[-2**16:])[0]
    call_args = json.loads(f'[{call_arg_str}]')
    plotly_json = {'data': call_args[1], 'layout': call_args[2]}    
    return plotly.io.from_json(json.dumps(plotly_json))


if __name__ == '__main__':
    write()
    read_from_json()
    read_from_html()