null values reset stacking in express barchart
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 52/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- python
- Domain
- data-visualization
Research direction
Start with the plotly.express.bar call in the supplied reproducer and compare its null-handling with the upstream JavaScript behavior referenced in the issue. Recreate the example using the medals_wide data and verify that South Korea's following bar remains stacked to a total of 35 rather than restarting at zero.
Written by the indexing model from the issue text.
Description
It seems like null values in the middle of a series reset the stacking so that the next value starts at zero. I tried it upstream in a JS codepen and it is handled okay there, so I believe it is an issue with the python API or possibly with plotly.express.
Reprex modified from https://plotly.com/python/bar-charts/#bar-charts-with-text
import plotly.express as px
wide_df = px.data.medals_wide()
# set null value in middle 'silver' series
wide_df.iloc[0,2] = None
fig = px.bar(
wide_df,
x="nation",
y=["gold", "silver", "bronze"],
title="Nulls Reset Stacking",
text_auto=True)
fig.show()
Output:
Based on input data:
Note that South Korea should be stacked to a total of 35 and not 24.
- Dominant language
- Python
- Stars
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- Avg merge
- 13h 41m
- Merged PRs (30d)
- 21
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