Jeroen Janssens
@jeroenjanssens.com
DevRel at Posit. Author of Python Polars: The Definitive Guide & Data Science at the Command Line
We’re excited to launch the Posit Open Source website! 🚀 We’ve unified 15+ years of tools, 900+ blogs, and 1,600+ videos in one place. Explore it here: opensource.posit.co Huge thanks to the team: @cwick.co.nz Greg Swinehart @hadley.nz @ivelasq3.bsky.social @jeroenjanssens.com
Are you on LinkedIn? If so, follow our new Posit Open Source LinkedIn Showcase Page! www.linkedin.com/showcase/117... We’ll be sharing updates, deep dives, and behind-the-scenes looks at everything we're developing for #RStats, #Python, and beyond. Tag us so we can see what you are building, too! 🤓
I am starting to prep for my #positconf2025 talk this year, and I am excited but also a bit nervous 😅 because I am sharing how TERRIBLE things went for me the first time I tried to learn Python! 🐍 Hoping it will be interesting to the Python-curious and beyond: posit.co/conference/
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I just finished recording an amazing #PydyTuesday Uncut episode with @wesmckinney.com. We look at scraped GitHub data, untangle deeply nested JSON, and create some sort of pulse signal for various popular GitHub repos. 📽️ Watch the full episode here: lnkd.in/eKtuxAjg
I've recorded another #PydyTuesday Uncut session with @mchow.com. Watch the full episode: www.youtube.com/watch?v=kyVS...
@jeroenjanssens.com So cool to see your LinkedIn post today about the #plotnine website update. Glad the library is getting some loving! www.linkedin.com/posts/jeroen... posit.co/blog/three-m...
🎉 Exciting updates to the Plotnine website are now live! | Jeroen Janssens
🎉 Exciting updates to the Plotnine website are now live! We've completely transformed the user experience with: ✨ A sleek new homepage design that better showcases what Plotnine can do 🖼️ An enh...
linkedin.com
New post! Great Tables: Becoming the Polars .style property When you use Polars `DataFrame.style` it returns a Great Tables object. This is a bit cheesy, but I look back on all the pieces the open source community chipped in to make this happen 🥲. posit-dev.github.io/great-tables...
![Python code using Polars and great_tables libraries to create a DataFrame with two columns and apply a blue background style to rows where column 'a' contains null values. The code is followed by an image showing the resulting styled table.
Here is the Python code:
```
import polars as pl
from great_tables import loc, style
(
pl.DataFrame({"a": [1, None], "b": [3, 4]})
.style
.tab_style(
style.fill("aliceblue"),
loc.body(rows=pl.col("a").is_null())
)
)
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:7gygvhegj2i2q2ebjqozbkkd/bafkreidkx6xs4gktbtsjp4djso7ztqsgjtrskdugmgxxmwl7qsk6sgh4zm)
Our book is out! 🥳 It’s official: 𝙋𝙮𝙩𝙝𝙤𝙣 𝙋𝙤𝙡𝙖𝙧𝙨: 𝙏𝙝𝙚 𝘿𝙚𝙛𝙞𝙣𝙞𝙩𝙞𝙫𝙚 𝙂𝙪𝙞𝙙𝙚 is now available in both ebook and print formats at your favorite bookstore! 📚 Grab your copy now: polarsguide.com
Today! 12pm ET - This hangout is gonna be great! Jeroen is the author of Data Science at the Command Line and has a new book coming out soon on Polars. Follow him here: @jeroenjanssens.com Add today's call to your calendar here: pos.it/dsh No slides, not a webinar, more like a weekly data AMA!
🎉 Exciting news! Our book Python Polars: The Definitive Guide is officially off to the printer! 🚀 Can't wait? Visit polarsguide.com, enter your name and email, and we'll send you an email with a link to the first chapter (courtesy of @oreilly.bsky.social). Stay tuned for the full release! 📚
I'm thrilled to announce that I've joined @posit.co as a Senior Developer Relations Engineer. 🎉 Posit is the company behind some of the most popular and impactful tools for data science, including Shiny, Quarto, Positron, Tidyverse, Great Tables, and Plotnine.
Today is my last day at Xomnia. I took a moment to reflect on the past two incredible years, and a few personal highlights stand out: jeroenjanssens.com/goodbye-xomn...
Goodbye Xomnia | Jeroen Janssens
Blog article by Jeroen Janssens. Jan 31, 2025. 2 min read. Today is my last day at Xomnia. As I take a moment to reflect on the past two incredible years, a few personal highlights stand out: Falling ...
jeroenjanssens.com
