Jeroen Janssens
@jeroenjanssens.com
DevRel at Posit. Author of Python Polars: The Definitive Guide & Data Science at the Command Line
Reposted by Jeroen Janssens
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/
Hoping it will be interesting to the Python-curious and beyond:
posit.co/conference/
Posit
Connect with a vibrant global community of R and Python data scientists at Posit's annual conference. Learn, share, and grow your expertise in data science.
posit.co
July 25, 2025 at 4:52 PM
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/
Hoping it will be interesting to the Python-curious and beyond:
posit.co/conference/
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
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
July 21, 2025 at 4:49 PM
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
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...
July 7, 2025 at 1:25 PM
I've recorded another #PydyTuesday Uncut session with @mchow.com. Watch the full episode: www.youtube.com/watch?v=kyVS...
Reposted by Jeroen Janssens
@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...
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...
www.linkedin.com
June 26, 2025 at 11:43 PM
@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...
www.linkedin.com/posts/jeroen...
posit.co/blog/three-m...
Reposted by Jeroen Janssens
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...
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@jpeg)
April 17, 2025 at 4:18 PM
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...
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...
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
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
April 2, 2025 at 1:21 PM
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
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
Reposted by Jeroen Janssens
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!
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!
March 13, 2025 at 3:22 PM
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!
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! 📚
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! 📚
February 19, 2025 at 8:04 PM
🎉 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! 📚
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.
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.
February 10, 2025 at 2:08 PM
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.
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
January 31, 2025 at 9:49 AM
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...