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GeezerVison is showing github.com — fix: Remove global warning format side effect by emmanuel-ferdman · Pull Request #5481 · plotly/plotly.py

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@emmanuel-ferdman

@emmanuel-ferdman emmanuel-ferdman commented Feb 5, 2026

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Code PR

  • I have read through the contributing notes and understand the structure of the package.
  • I have added tests or modified existing tests.
  • For a new feature, I have added documentation examples (please see the doc checklist as well).
  • I have added a CHANGELOG entry if changing anything substantial.
  • For a new feature or a change in behavior, I have updated the relevant docstrings in the code.

Summary

Importing plotly.tools or plotly.offline overwrites Python's global warnings.formatwarning. This changes how all warnings look, not just plotly's. Breaks output for user code and other libraries. The custom format was added in 2014 for cosmetic reasons but the global side effect was unintended. This PR removes it because Python's default format works.

Fixes #5472
Fixes #3872

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@emmanuel-ferdman
fix: Remove global warning format side effect
d08c05f 
Signed-off-by: Emmanuel Ferdman <[email protected]>
@camdecoster camdecoster assigned emilykl Feb 6, 2026
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camdecoster commented Feb 6, 2026

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Thanks for the contribution! We'll get someone on our team to review it soon.
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@emilykl
Merge branch 'main' into fix-warnings-format
87befc3
emilykl
emilykl approved these changes Feb 13, 2026
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Thanks for this change @emmanuel-ferdman ! We're not terribly attached to our custom warning format, and changing the format globally obviously isn't good behavior, so I do think the best fix here is indeed to remove the custom formatting altogether.

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@emilykl

emilykl commented Feb 16, 2026

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The only CI failure is the docs build which looks unrelated, so merging anyway.
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@emilykl
emilykl merged commit b2fcf3b into plotly:main Feb 16, 2026
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@emilykl emilykl mentioned this pull request Feb 19, 2026
Stop overriding global warnings.formatwarning #5506
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@emilykl emilykl emilykl approved these changes
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Successfully merging this pull request may close these issues.

[BUG]: plotly breaks warnings format Importing plotly.tools changes warnings.formatwarning as a side effect

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@emmanuel-ferdman @camdecoster @emilykl
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