px.bar fails in Python

[ryan-williams]

Sample notebook: https://starboard.gg/nb/nf9YixM

Just one cell:

import pandas as pd
import micropip
await micropip.install(['plotly==5.1.0'])

import plotly.express as px

px.bar(x=[1,2,3], y=[4,5,6])

It seems to get through micropip.install and import, but then calling px.bar fails with:

Python exception:
Traceback (most recent call last):
  File "/lib/python3.9/site-packages/plotly/io/_renderers.py", line 530, in <module>
    webbrowser.get()
AttributeError: module 'webbrowser' has no attribute 'get'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/lib/python3.9/site-packages/plotly/basedatatypes.py", line 810, in _repr_html_
    bundle = self._repr_mimebundle_()
  File "/lib/python3.9/site-packages/plotly/basedatatypes.py", line 822, in _repr_mimebundle_
    renderer_str = pio.renderers.default
  File "/lib/python3.9/site-packages/_plotly_utils/importers.py", line 36, in __getattr__
    class_module = importlib.import_module(rel_module, parent_name)
  File "/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 855, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/lib/python3.9/site-packages/plotly/io/_renderers.py", line 532, in <module>
    except webbrowser.Error:
AttributeError: module 'webbrowser' has no attribute 'Error'

Here's the same notebook in jupyterlite; the plot renders successfully: https://runsascoded.com/jupyter/lite/retro/notebooks/?path=plotly-test.ipynb

I see a couple mentions of plotly in the "federated_extensions" and "piplite_urls" sections of jupyterlite/examples/jupyter_lite_config.json, I guess there's some configuration that lets plotly work "out of the box" in the jupyterlite demos, that could be adapted here?

[gzuidhof]

It looks like there was some work into Jupyterlite to support Plotly, I would like to also support it in Starboard of course :). They seem to load a specific extension like you mentioned (this seems to be the PR: jupyterlite/jupyterlite#129). I am sure we can support it without needing to have the ability to support these kinds of extensions.

This is where it currently falls over: https://github.com/plotly/plotly.py/blob/master/packages/python/plotly/plotly/io/_renderers.py#L526-L536. We should probably have a mock version of ipython, I expect a lot of packages will depend on that

From what I understand this browser renderer actually opens a webbrowser normally. It creates a webserver that serves a page once.

I think the next step here is to mock out ipython, the alternative would be to request a patch into plotly.js itself to support custom pyodide environments better, or monkeypatch it ourselves (not a fan!).

[lakshyapriyadarshi]

Is there a way I can use Plotly in the notebook? @ryan-williams @gzuidhof