What weâre about
SLIDES FROM OUR MEETUPS ARE AVAILABLE FOR DOWNLOAD: https://github.com/pydatacardiff
If you are interested in talking at PyData Cardiff (anything from 5 mins to 1 hour) please send us an email at pydatacardiff@gmail.com. We'd like to welcome speakers of all abilities and experience, even if you just want to stand up and introduce yourself, your work, and what you hope to gain from PyData Cardiff, that would be great!
PyData is an educational program of NumFOCUS, a 501(c)3 non-profit organization in the United States. PyData provides a forum for the international community of users and developers of data analysis tools to share ideas and learn from each other. The global PyData network promotes discussion of best practices, new approaches, and emerging technologies for data management, processing, analytics, and visualization. PyData communities approach data science using many languages, including (but not limited to) Python, Julia, and R.
In 2014, the first PyData meetup group in the United Kingdom was set up in London. This has become a great success, with now over 8500 members at the end of 2018. This new group has been set up to extend the PyData community into Wales. There is a fast developing tech scene in our city, and we welcome all to join us. We will be working very closely with PyData Bristol, who have also set up a PyData meetup at the start of 2018.
The PyData Code of Conduct (http://pydata.org/code-of-conduct.html) governs this meetup. To discuss any issues or concerns relating to the code of conduct or the behavior of anyone at a PyData meetup, please contact the local group organizers (message us on the meetup page). Please also submit a report of any potential Code of Conduct violation directly to NumFOCUS: https://numfocus.typeform.com/to/ynjGdTThank you for helping us to maintain a welcoming and friendly PyData community!
Hey Cardiff! đ Ready to dive into the world of data science, Python, and all things analytics? Join us on Thursday, 31st July, at the iconic Hodge House for an evening of learning, networking, and inspiration. Whether youâre a seasoned data wizard or just starting your journey, this meetup is your chance to connect with fellow enthusiasts and soak up some seriously cool insights.
Whatâs on tap?
- Two guest talks from Marco Gorelli and James C Yarrow.
- A chance to mingle with some of Cardiffâs brightest minds and share tales.
- Real-world stories, cutting-edge techniques, and actionable takeaways to level up your data game.
Talks
Marco Gorelli - Creator and Maintainer of Narwhals
Ever tried passing a Polars Dataframe to a Data Science library and found that it.. just works? No errors, no panics, no noticeable overhead, just... results? This is becoming increasingly common in 2025, yet only 2 years ago, it was mostly unheard of. So, what changed? A large part of that answer is: Narwhals.
Narwhals is a lightweight compatibility layer between dataframe libraries which lets your code work seamlessly across Polars, Pandas, PySpark, DuckDB and more! It's not just a theoretical possibility: with approaximately 30 million monthly downloads and set as a required dependency of Altair, Bokeh, Marimo, Plotly, Shiny and more, it's clear that it's reshaping the Data Science landscape.
By the end of the talk, you'll understand why writing generic Dataframe code was such a headache (and is no longer such a pain), how Narwhals works and how its community operates, and how you can use it in your projects today. The talk will be technical yet accessible and light-hearted.
James C Yarrow, Senior Data Engineer at Future Publishing - Python and the Data Platform in 2025
This will be a walkthrough of the modern data platform, the capabilities and the challenges Python is solving and how other tools like Airflow and DBT play a role in the modern data platform.
Agenda (A rough idea of what to expect):
- 6:30 PM: Doors open + mingling (sparky conversations and Python trivia?)
- 7:00 PM: Introductions to the night
- 7:15 PM: Kickoff with the first talk with Marco.
- 8:00 PM: Interlude!
- 8:15 PM: The second talk with James.
- 9:00 PM: Optional Trip to the pub to continue talking about AI / Data
P.S. Follow us @pydatacardiff on x.com for speaker reveals, sneak peeks, and the occasional meme about pandas (the library kind).
#PyDataCardiff | Hosted at Hodge House
Letâs code, connect, and celebrate data together! đâ¨
***
Event organized by the PyData Cardiff Team.
Venue Sponsor by Future Publishing.
(thank you, legends!).
Upcoming events (1)
See all- PyData Cardiff - July 2025Coffee Lounge @ Hodge House, Cardiff
Hey Cardiff! đ Ready to dive into the world of data science, Python, and all things analytics? Join us on Thursday, 31st July, at the iconic Hodge House for an evening of learning, networking, and inspiration. Whether youâre a seasoned data wizard or just starting your journey, this meetup is your chance to connect with fellow enthusiasts and soak up some seriously cool insights.
Whatâs on tap?- Two guest talks from Marco Gorelli and James C Yarrow.
- A chance to mingle with some of Cardiffâs brightest minds and share tales.
- Real-world stories, cutting-edge techniques, and actionable takeaways to level up your data game.
Talks
Marco Gorelli - Creator and Maintainer of Narwhals
Ever tried passing a Polars Dataframe to a Data Science library and found that it.. just works? No errors, no panics, no noticeable overhead, just... results? This is becoming increasingly common in 2025, yet only 2 years ago, it was mostly unheard of. So, what changed? A large part of that answer is: Narwhals.
Narwhals is a lightweight compatibility layer between dataframe libraries which lets your code work seamlessly across Polars, Pandas, PySpark, DuckDB and more! It's not just a theoretical possibility: with approaximately 30 million monthly downloads and set as a required dependency of Altair, Bokeh, Marimo, Plotly, Shiny and more, it's clear that it's reshaping the Data Science landscape.
By the end of the talk, you'll understand why writing generic Dataframe code was such a headache (and is no longer such a pain), how Narwhals works and how its community operates, and how you can use it in your projects today. The talk will be technical yet accessible and light-hearted.James C Yarrow, Senior Data Engineer at Future Publishing - Python and the Data Platform in 2025
This will be a walkthrough of the modern data platform, the capabilities and the challenges Python is solving and how other tools like Airflow and DBT play a role in the modern data platform.Agenda (A rough idea of what to expect):
- 6:30 PM: Doors open + mingling (sparky conversations and Python trivia?)
- 7:00 PM: Introductions to the night
- 7:15 PM: Kickoff with the first talk with Marco.
- 8:00 PM: Interlude!
- 8:15 PM: The second talk with James.
- 9:00 PM: Optional Trip to the pub to continue talking about AI / Data
P.S. Follow us @pydatacardiff on x.com for speaker reveals, sneak peeks, and the occasional meme about pandas (the library kind).
#PyDataCardiff | Hosted at Hodge House
Letâs code, connect, and celebrate data together! đâ¨***
Event organized by the PyData Cardiff Team.
Venue Sponsor by Future Publishing.
(thank you, legends!).
Past events (22)
See all- Network event619 attendees from 93 groups hostingPyData London 2025This event has passed