feature: generate additional comments during jupyer2marimo notebook converter (for modified or redefined variables)

[bmerkle]

• enhance variable renaming with comments during notebook conversion
• comment for modified or redefined variable is attached for better understanding

📝 Summary

Enhanced variable renaming with contextual comments during Jupyter → marimo conversion.
When variables are renamed, modified, or redefined as part of the conversion process, explanatory comments are automatically attached. This improves traceability, preserves intent, and makes the resulting marimo notebook easier to understand and review—especially for non-trivial refactorings introduced during conversion.

🔍 Description of Changes

• for modified or redefined variable an additional python comment is generated

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

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Project	Deployment	Review	Updated (UTC)
marimo-docs	Ready	Preview, Comment	Jan 5, 2026 10:51pm

[bmerkle]

I have read the CLA Document and I hereby sign the CLA

[dmadisetti]

Thanks for this.
Noticed a slight discrepancy in the tests.

If this is for reconstruction, then we need to account for in place operations

# ie
x += 1
# vs
x = x + 1

[bmerkle]

@dmadisetti is the PR ok from your side ?

[dmadisetti]

Thanks for checking in @bmerkle

I think this might add a lot of noise without a ton of value to the user. The benefit I see from doing something like this is that we could potentially exactly reconstruct the ipynb output in addition to letting the user know there's been a change.

But! This is implementation is lacking since it still doesn't distinguish in-place operations.
Maybe we show the converted code exactly and don't need to make the redefined distinction? e.g.

# originally: x += 1
x_1 = x + 1  # No double stacking comments!

Thoughts? @akshayka may also have ideas- but hold off on implementation and we can discuss. Thanks for taking the initiative though!

[bmerkle]

@dmadisetti thanks for the feedback. I will hold off implementation until we have agreed on the best approach. @akshayka
I like the idea with the original code as comment above.

The idea was to make it more transparent to the user, where the code came from during the conversion.
We might offer this feature also only as opt-in or opt-out, so somebody who already knows the conversion rules is not cluttered with additional comments. But for debugging or new users i think is is absolutely a good thing to have traces...

we can also chat at discord if that is more efficient