This fixes the issue where a matplotlib figure with only bottom and left tick markers would be converted to a plotly figure with markers on all sides.

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I have read through thecontributing notes and understand the structure of the package. In particular, if my PR modifies code ofplotly.graph_objects, my modifications concern the code generator andnot the generated files.
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.
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robertoffmoura force-pushed therm/fix-tick-marker-mirroring branch 2 times, most recently from3fafa67 todaf0327Compare

August 8, 2025 11:06

gvwilson requested a review fromemilykl

August 11, 2025 17:07

gvwilson assignedemilykl

Aug 11, 2025

gvwilson added P1

needed for current cycle

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fixfixes something broken labels

Aug 11, 2025

robertoffmoura added2 commits

August 12, 2025 10:25

Fix tick marker mirroring

df1a759

Run ruff format

001ff53

robertoffmoura force-pushed therm/fix-tick-marker-mirroring branch from860b8b0 to001ff53Compare

August 12, 2025 09:31

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emilykl commentedOct 1, 2025

Hi@robertoffmoura, thank you for the fix! Same question here, could you provide some side-by-side comparisons to show the difference this PR introduces and why this is the correct behavior? I'm not very familiar with axis mirroring in matplotlib (or Plotly for that matter) so just trying to sanity check that these changes make sense.

I took a quick look at the images of the plots in the tests you added, and the only one where I see a difference between your branch andmain is in theaxis_mirror_false_with_one_sided_ticks function, is that expected?