What we’re about
We're a group of enthusiastic users of the popular Python programming language, meeting to exchange knowledge and experiences. Please subscribe and visit our meetings to exchange knowledge, ideas and get to know some nice fellow Python people!
By participating to our meetings you agree with and subscribe to the Python Software Foundation Code of Conduct which can be found at https://policies.python.org/python.org/code-of-conduct/
Upcoming events
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Python Leiden User Group January 2026 meeting
Technolab, Bètaplein 28, 2321 KS, Leiden, NLCome join our community of people interested in and working with the Python programming language. We meet up in the city of Leiden, The Netherlands. Exchange experiences and learn from others on the topic of the most popular programming language!
We meet up once every two months. The meetups are low profile, not commercial, and open to both professionals and enthusiasts.
At this meeting, we have three talks planned:
Talk 1: Simple perfect setup: Handy task runner for data projects. Prefect.io by Reinout van Rees
This is a reprise of Reinouts talk at PyUtrecht in November 2025, which he kindly offered to repeat for us in Leiden.
Talk 2: PostgreSQL + Python in 2026 by Aleksandr Dinu
More or less as a follow-up on Matthijs' November talk on using MongoDB, Aleksandrs talk focuses on how to make most of PostgreSQL with your Python app using modern solutions.
Talk 3: PR vs ROC curves, which to use? by dr. ir. Sultan K. Imangaliyev
Many data practitioners use Precision-Recall (PR) and Receiver Operating Characteristics (ROC) curves interchangeably, but they tell very different stories — especially when your data is imbalanced. In this talk, Sultan will explain:
- What PR and ROC curves actually mean (in simple terms)
- How they differ in their assumptions
- When to use one over the other (with real examples)
- Show a live demo using Python and scikit-learn
Meeting format
Our meetings will have presentations with room for discussion, and we will make sure there's also opportunity to meet and get to know your fellow group members.
About our meetups
Our talks happen in a friendly and informal setting. They are a great way to learn new things, share your knowledge, and meet other Python enthusiasts. There is always room for questions and discussion. Our presentations and talks are in English to be accessible for the large amount of non-Dutch speakers in the Python community.
Call for talks
We'd invite you to propose a talk for future meetings. Talks can be short or longer, they can include a live demo or a hands-on lab. It does not matter if you're not a highly experienced speaker. Meetup groups like this are great for building out your skills.
Meeting venue
Our meeting will take place at the “Technolab”, an organization that offers science education for children and teenagers. We’ll be using the big meeting room, while the people from “The Space Leiden”, a local hacker/makerspace, will also be present in the building. The Space will be open starting 19:00.
Our food sponsor Samotics is providing free pizza. If you don't care for pizza, you can also skip those and arrive at 20:00.
Our location can be tricky to find for first-timers, please check the page on our website here.24 attendees
Past events
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