donkirkby/live-py-plugin

Add LiveFigureDiffer

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#760 opened on Feb 18, 2026

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enhancementhelp wanted

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Description

We have LiveImageDiffer for comparing images and LiveFigure for displaying Matplotlib figures in live coding mode. Derive LiveFigureDiffer as a subclass, and override create_painters() to create two figures. Make sure it gracefully degrades when Matplotlib is not available.

Make LiveImageDiffer work with LiveImage, and convert them to LivePainter when needed. Add create_figures() method to LiveFigureDiffer to help with type checking.

Another option is to make LiveImageDiffer a generic class that can compare any subtype of LiveImage.

Contributor guide

Research direction
Inspect existing LiveImageDiffer and LiveFigure classes, then derive LiveFigureDiffer and ensure it degrades gracefully without Matplotlib.
Tech stack
python
Domain
developer experience
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitPython
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75