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Add a dedup history preserving catch_warnings #197

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Add a dedup history preserving catch_warnings #197

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0420830
Add a dedup history preserving `catch_warnings`
llucax Sep 18, 2026
27adcf7
Add a fast path for `action="ignore"`
llucax Sep 18, 2026
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2 changes: 1 addition & 1 deletion RELEASE_NOTES.md
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Expand Up @@ -10,7 +10,7 @@

## New Features

<!-- Here goes the main new features and examples or instructions on how to use them -->
- A new `frequenz.core.warnings` module with a `catch_warnings` drop-in replacement for `warnings.catch_warnings` that preserves the warnings deduplication history, so warnings already shown before a block are not shown again after it. This works around [python/cpython#73858](https://github.com/python/cpython/issues/73858), where merely entering and leaving a `catch_warnings` block makes every warning in the program repeat. It relies on CPython internals (verified on 3.11 to 3.15) and falls back to the standard behaviour on interpreters that don't behave as expected, see the module documentation for the details and limitations.

## Bug Fixes

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