Plotly.express.imshow shows letters behind numbers when number is small (i.e 1.19e-07)

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
data-visualization

Research direction

Start by reproducing the reported Plotly.express.imshow heatmap behavior with values near 1.19e-07 and compare the rendered labels with the console output. Trace the formatting path responsible for the cell text; done means small values are displayed numerically rather than as letters, without regressing normal heatmap labels.

Written by the indexing model from the issue text.

Description

bug P3

While doing a course in statistics I came across the issue where numbers approaching 0 appear as letters instead of their numerical representation when using imshow for heatmaps.

Such as ending in ‘f’ for ‘OP1 - OP4’ and ‘n’ for ‘OP3 - OP4’ as seen below. Is there a way to fix this? While not dealbreaking, since Dunn’s test doesn’t benefit from displaying values below 0.01, it is still weird and unexpected behavior…

Screenshot from Plotly:

Image

Screenshot from console log:

Image
Dominant language
Python
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