`px.scatter(df, ..., render_mode="webgl")` fails when color column contains all `NaN`
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bug
P3
- Dominant language
- Python
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Description
Code to reproduce the issue:
import pandas as pd
import numpy as np
import plotly.express as px
df = pd.DataFrame({"x": [0, 1], "y": [0, 1], "c": [np.nan, np.nan]})
px.scatter(df, x="x", y="y", color="c", render_mode="webgl")
Error:
There will be no issue for all the cases below:
remder_mode="svg""c": [None, None]"c": [np.nan, 1] # i.e., not all NaN
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by running the provided pandas and Plotly Express reproducer, then compare the failing render_mode="webgl" case with SVG and the listed color-column variants. Done means all-NaN color data no longer raises an error in WebGL while the other cases continue to work.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- numpy, pandas, python
- Domain
- data-visualization
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 45/100