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marcogorelli.bsky.social @marcogorelli.bsky.social · 16/09/2026

✨ The Pyrefly type-checker now tracks Polars DataFrame schema 🏷️ Declare a schema using Annotated 📚 Enjoy clearer self-documenting code and avoid some schema-related issues before hitting prod 😇 The annotated schema will be ignored by other type-checkers so you won't get conflicts between them

Example of using `Annotated` to declare Polars DataFrame schema

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marcogorelli.bsky.social @marcogorelli.bsky.social · 09/04/2026

✨ New Narwhals expression: `nw.corr` 👥 Supported in both group-by and window contexts 🌐 Polars, DuckDB, PyArrow, PySpark, pandas...all supported 🗒️ PS. please don't draw conclusions about ice cream sales and drownings from this post

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marcogorelli.bsky.social @marcogorelli.bsky.social · 10/03/2026

Bwlch Llanberis (Welsh folk tune) Named after a scenic road in Snowdonia, this is one of my favourite Welsh melodies

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marcogorelli.bsky.social @marcogorelli.bsky.social · 22/02/2026

Tafliad Carreg (Welsh folk tune) This one was written by Mike Lease, and it means "A stone's throw" Here's my attempt at it. First time tuning my guitar to DADGAD, and my initial impression is that standard tuning might be a mistake

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marcogorelli.bsky.social @marcogorelli.bsky.social · 13/02/2026

✨ @marimo.io now supports Pyrefly as an LSP, helping you to catch errors before you even execute your code! ⚙️ To enable it: - Install pyrefly - Settings -> User settings -> Enable pyrefly 🤸 This was a fun one to contribute to (🙏 Note that the ty type checker is also supported)

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marcogorelli.bsky.social @marcogorelli.bsky.social · 30/01/2026

✨ New @pola.rs feature: if you misspell a time zone, it will suggest the correct one to you 🤸‍♂️This was a fun one to work on, Levenshtein and all!

Demo of Polars suggesting the correct time zone

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marcogorelli.bsky.social @marcogorelli.bsky.social · 04/01/2026

✨ New Polars features: `min_by` and `max_by` 💡 Get the first (or last) value of a column ordered by another expression 🌊🦄 Narwhals will have this feature too, making it available to @arrow.apache.org , pandas, @duckdb.org , and more

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marcogorelli.bsky.social @marcogorelli.bsky.social · 04/12/2025

😱🙀 The pandas 3.0 release-candidate is here! 💥 Will it break your code? 💡 Test it with `uv pip install -U --pre pandas` to find out! 🌊🦄 Narwhals users can relax, everything's taken care of for you, no need to do anything ☺️

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marcogorelli.bsky.social @marcogorelli.bsky.social · 13/11/2025

✨ The next @pola.rs release will support lazy pivot! 💡 All you need is to specify the unique values to pivot on

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marcogorelli.bsky.social @marcogorelli.bsky.social · 10/11/2025

✨ Narwhals now supports Daft! 🔌Just install the `narwhals-daft` plugin, and then `narwhals.from_native` will accept Daft DataFrame! 💡 No extra dependencies requires, computation will remain native (and distributed, and lazy!) until you call `collect`

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marcogorelli.bsky.social @marcogorelli.bsky.social · 04/11/2025

😲 Wes McKinney mentioned Narwhals on a podcast

Screenshot of Wes mentioning Narwhals on a podcast

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marcogorelli.bsky.social @marcogorelli.bsky.social · 23/10/2025

✨ New @pola.rs feature: `list.agg` 💡 Compute any Expr aggregation on a list column, just use `pl.element()` 🔜 Coming soon, in version 1.35!

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marcogorelli.bsky.social @marcogorelli.bsky.social · 20/10/2025

🥧🧵 Narwhals now tests against Python 3.14 (pi-Python!) free-threading build 👉 For more on free-threaded Python, my colleague Nathan's blog post is an excellent read, link in comments

Demo of Narwhals running with free-threaded Python

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marcogorelli.bsky.social @marcogorelli.bsky.social · 16/10/2025

✨ Narwhals now supports `format` across all backends 🧵 Create new string columns using placeholders and expressions 🌊🦄 Yet another piece of the @pola.rs API brought to pandas, @duckdb.org , PySpark, PyArrow, and more!

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marcogorelli.bsky.social @marcogorelli.bsky.social · 13/10/2025

✨ NumPy's MaskedArray class is now type-complete 🏷️ Enjoy improved code completion and typing! 🙏 Thank you to Quansight Labs and Meta for having facilicated and funded the work (blog post in comments)

Before vs after of using MaskedArray methods in NumPy

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marcogorelli.bsky.social @marcogorelli.bsky.social · 03/10/2025

🌝 The next @astropy.org release will support generic dataframe tables (like @pola.rs ) 🌊🦄 Powered by Narwhals

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marcogorelli.bsky.social @marcogorelli.bsky.social · 12/09/2025

💡 Life-pro-tip: enable inline type hints 🏷️ Your editor will display inferred types for variables you haven't annotated 🕵️ Debugging those red squiggly lines will become much easier

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marcogorelli.bsky.social @marcogorelli.bsky.social · 23/08/2025

polars Series implement __array__, I'd have thought that a lot of the time you can pass Series as then they'll be converted by any `np.asarray` call. at least passing Polars Series to matplotlib works like that

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marcogorelli.bsky.social @marcogorelli.bsky.social · 23/08/2025

which stats packages are tied to pandas?

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marcogorelli.bsky.social @marcogorelli.bsky.social · 22/08/2025

✨🐼 Pandas 3.0 will have `pd.col` syntax 💡 You can use it for clean chaining in `assign` and `loc` 🚀 It's happening, the PR just got merged!

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marcogorelli.bsky.social @marcogorelli.bsky.social · 12/08/2025

✨ New @pola.rs feature - you can now chain `name` expressions! 🌊🦄 As of Narwhals 2.0 (yes, we've released 2.0 🚀), this feature is available there as well! Little example below with our friend @duckdb.org

Example of `.name` chaining with Narwhals

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marcogorelli.bsky.social @marcogorelli.bsky.social · 07/08/2025

💡 "There's nothing for permanent than a temporary fix" Case in point, this pandas comment which was added [checks git log] ... 12 years ago 🙈

temporary solution added to pandas 12 years ago

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Reposted by @marcogorelli.bsky.social

Michael E. Mann @michaelemann.bsky.social · 07/08/2025

"If the U.S. can't get its greenhouse emissions under control, they need to face real consequences" said the rest of the world.

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marcogorelli.bsky.social @marcogorelli.bsky.social · 29/07/2025

💡 Today in open source: a 17-year-old NumPy commit promising that a new feature will be coming soon Any day now..

Screenshot of 17-year-old commit message in NumPy

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marcogorelli.bsky.social @marcogorelli.bsky.social · 26/07/2025

😍 @posit.co have done it again 🧙 gt-extras offers even more functionality for their table renditions of @pola.rs and pandas dataframes! 🌊🦄 Using Narwhals for some dataframe logic

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marcogorelli.bsky.social @marcogorelli.bsky.social · 18/07/2025

💡 Solution: use Narwhals for universal dataframe support 🌊🦄

Meme of panicked Astronomer CEO caught on cam with the head of HR, with "When you find a new data science library" and "When you realise it only supports pandas" text overlaid

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marcogorelli.bsky.social @marcogorelli.bsky.social · 15/07/2025

✨ New Formulaic release (1.2), featuring native support for @pola.rs ! 🌊🦄 Powered by Narwhals

Demo of Formulaic with native Polars support

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marcogorelli.bsky.social @marcogorelli.bsky.social · 09/07/2025

🎢 When the Q&A goes off-script 🤣 🇯🇵 Japanese math rock, 🅿️ porpoises and unfortunate aliases, and 🎤 Taylor Swift: 🥈All of these unexpectedly came up in this fun session, which is currently the 2nd most viewed of the conference 🙏 Thanks @pydatalondon.bsky.social for inviting me!

youtu.be

Marco Gorelli - How Narwhals brings Polars, DuckDB, PyArrow, & pandas together | PyData London 25

YouTube video by PyData

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marcogorelli.bsky.social @marcogorelli.bsky.social · 01/07/2025

🥳 The next version of @mlflow.org will support @pola.rs ! 😩 Slightly disappointingly, they do so by converting to pandas 🌊🦄 Could Narwhals help make MLFlow gain native support for Polars? Link to the discussion below 👇

MLFlow maintainer announcing that they merged the Polars dataset PR

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marcogorelli.bsky.social @marcogorelli.bsky.social · 19/06/2025

🙀 It's scary to merge a 2,000+ line PR! 😇 But, this one was so thorough that we just had to ship it 🏆 Thanks to an incredible effort by Ryan Whitten, Narwhals supports Ibis! 💡You can now use Narwhals with all of Ibis' backends, plus some extra, whilst keeping @pola.rs expressive API!

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marcogorelli.bsky.social @marcogorelli.bsky.social · 06/06/2025

✨ @pola.rs now supports `list.filter` 🪄 The `list` namespace is now even more turbocharged ⚡ 👇 Full release notes for 1.30

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marcogorelli.bsky.social @marcogorelli.bsky.social · 26/05/2025

✨ PySpark 4.0 is out 🌊🦄 And it's already supported by Narwhals, including PySpark connect (thanks Francesco Bruzzesi!)

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marcogorelli.bsky.social @marcogorelli.bsky.social · 26/05/2025

Looks like a good decision, given she committed fraud

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marcogorelli.bsky.social @marcogorelli.bsky.social · 22/05/2025

✨ Narwhals now supports `fill_null` with forwards and backwards strategies 🎬 Here's a demo of a fill-forward function which supports PySpark, @pola.rs , @duckdb.org , pandas, cuDF, and more! 🎁 Bonus: curious about what this looks like as DuckDB SQL? We got you covered 😎

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marcogorelli.bsky.social @marcogorelli.bsky.social · 09/05/2025

✨ Narwhals now supports PySpark 🎇 If you have a dataframe-agnostic function, you can pass in `pyspark.sql.DataFrame` 📈 Here's a demo, made with @marimo.io 🎁 BONUS feature: combine with SQLFrame, to generate SQL from @pola.rs syntax 🪄

Demo of Narwhals dataframe-agnostic function which supports PySpark

Plot of PySpark dataframe after converting it to PyArrow

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marcogorelli.bsky.social @marcogorelli.bsky.social · 07/05/2025

🛠️ NVIDIA's cuDF library now runs the Narwhals test suite as part of its CI process 🙀

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marcogorelli.bsky.social @marcogorelli.bsky.social · 30/04/2025

I still name my Marimo notebooks `untitled42.py` 🙈

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