GeezerVison is showing github.com — Use namespaced "matplotlib:coolwarm" to silence cmap ambiguity warning by hmaarrfk · Pull Request #1079 · fastplotlib/fastplotlib
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hmaarrfk
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Sep 10, 2026
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Hey @kushalkolar hopefully this one liner is ok with you!
This avoids a warning like:
WARNING: The name 'coolwarm' is an alias for 'matplotlib:coolwarm', but is also available as: 'paraview:coolwarm'.
To silence this warning, use a fully namespaced name.
This PR was written by Mark's AI agent (Claude Code). Mark has not yet reviewed this PR.
Reviewed it now!
More stuff from claude
Summary
"coolwarm" is ambiguous in the cmap package's catalog (present in both the matplotlib and paraview namespaces), so cmap.Colormap("coolwarm") emits the ambiguity warning above.- Use the fully namespaced
"matplotlib:coolwarm" in COLORMAPS, matching the pattern already used for other ambiguous names in that list (tol:, matlab:, vispy:, gnuplot:, yorick:).
- This namespace syntax is supported by
cmap>=0.1.3, which is already fastplotlib's declared minimum dependency, so no dependency bump is needed.
Test plan
- Confirmed the warning no longer fires when importing
fastplotlib.utils.functions after the change.
- Confirmed
"coolwarm" was not referenced as a literal string anywhere else in the codebase.
https://claude.ai/code/session_01XccZFAE1DAEaEx7LBhXE5W
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<details><summary>Claude's draft</summary>
`cmap.Colormap("coolwarm")` is ambiguous because "coolwarm" exists in
both the matplotlib and paraview catalogs, so `cmap` emits:
WARNING: The name 'coolwarm' is an alias for 'matplotlib:coolwarm',
but is also available as: 'paraview:coolwarm'.
To silence this warning, use a fully namespaced name.
Use the fully namespaced `"matplotlib:coolwarm"` in the `COLORMAPS`
list, matching the pattern already used for other ambiguous names in
this list (`tol:`, `matlab:`, `vispy:`, `gnuplot:`, `yorick:`). This is
supported by `cmap>=0.1.3`, which is already fastplotlib's declared
minimum, so no dependency bump is needed.
Resume this Claude session:
```
cd /Users/mark/git/pygfx/fastplotlib
claude --resume 4d91ae6a-7744-4d7e-90b3-d8c929fee89f
```
</details>
Claude-Session: https://claude.ai/code/session_01XccZFAE1DAEaEx7LBhXE5W
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clewis7
Awaiting requested review from clewis7
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