Michał (Mike) Krassowski

Introducing Molview - the ipython/jupyter widget version of nano-protein-viewer🔍:

I used to think the friction in community OSS/corporate dynamics comes from a difference in culture between organizations and teams. The more I see the same team flip between amazing and questionable contribution trajectory the more I think this comes down to changing internal direction/incentives.

It is hard to express criticism as an established maintainer. The words which I could say as a user now hit differently, even if I mean the same thing.

There are two things you should not remove when transitioning to a metapackage: integration tests and documentation. In fact, the transition should double down on these two things as they are critical to ensure the packages integrate well, and that discoverability is preserved.

If you will release a new, better, version but without a feature I like, I might come back and contribute it again.
If you release a new broken version, I may not be able to convince stakeholders to engage and come back, the trust in the project will be lost.

A mismatch of expectation on what irks #OSS maintainers: I saw folks really worry about removing a feature I contributed due to lack of bandwidth to port it to new version - but this was absolutely fine! I saw them remove tests and ignore my warning against it - and this is what in fact made me sad.

I think I tracked it down and Zach contributed this :) Thank you!

I'm really curious what is on the contributions slides. Is this a specific repo/subproject? How was it generated?

To install from PyPI:

pip install --pre --upgrade jupyterlab==4.5.0rc0

You can also install the RC from conda-forge (anaconda.org/conda-forge/...).

Thank you to Rosio Reyes for compiling the release notes, and thank you to everyone who contributed!

New debugger features include a "Paused in Debugger" overlay, better breakpoint and callstack cell annotations, and evaluation in a debugger console.

Search in terminal is now integrated with JupyterLab search widget

Audio and video files can be opened in the main area

New Python file can be created directly from context menu on the file browser.

New exciting features are coming to #JupyterLab 4.5.0. Please test the release candidate before & during the JupyterCon (next week!)

Major enhancements around:
- performance and scroll stability
- notebook editing
- table of contents
- debugger
- terminal

jupyterlab.readthedocs.io/en/latest/ge...

We've learned that our member communities care a *lot* about cloud cost transparency and reliability, so we're working hard to drill down into user data about costs and usage for community leaders to access.

Go from JupyterLab user to creator 🚀
At JupyterCon 2025, learn to build + publish custom extensions for real-world workflows — guided by experts in JupyterLab development.
🗓️ Nov 3 | San Diego
Details: sched.co/28H2m
Register: events.linuxfoundation.org/jupytercon/r...

Your Ideas, Our Support: Jupyter Community Call For Funding Proposals The Jupyter Executive Council and Jupyter Foundation are pleased to announce a call for proposals for the Jupyter community. Visit the…

🚨 The deadline for Jupyter Community Funding Proposals (blog.jupyter.org/your-ideas-o...) has been extended to October 5th, 2025 ( by one week). We've got a few great-looking proposals in the works (github.com/orgs/jupyter...), so you've all got another 7 days to write!

Register for JupyterCon 2025 by October 3 and save $300

WHO’S IN? JupyterCon is coming to San Diego Nov. 4-5 with bonus days for Technical Training (Nov. 3) & Community Sprints (Nov. 6).

Save $100 when you register by Oct. 3.

🔸 View the schedule: bit.ly/4gpqkzy

🔸Register: bit.ly/47C1XMK

Jupyter Community Workshops Are Back! The Jupyter Community Building Working Group is pleased to announce that the next call for proposals for Jupyter Community Workshops is now…

A reminder that there are two Call for Proposals out from the Jupyter Foundation!

👉 Jupyter Community Workshops: blog.jupyter.org/jupyter-comm...
👉 Jupyter Community Support funding: blog.jupyter.org/your-ideas-o...

Check them out and share the word!

Jupyter Community Call: September 2025 Hey Jovyans, we want to learn about the great things you’re doing with Jupyter! The Community Building working group is holding an open…

You’re invited to join the next Jupyter Community Call on September 4th, 2025.

Get updates from across the Jupyter ecosystem, hear talks from community members, and get involved. It’s a great way to connect, contribute, and engage!

The Zoom link in our blog post:
blog.jupyter.org/jupyter-comm...

Jupyter Community Workshops Are Back! The Jupyter Community Building Working Group is pleased to announce that the next call for proposals for Jupyter Community Workshops is now…

Jupyter Community Workshops are back! Workshops will be held through February 2026.

The call for proposals is open until September 7th! Learn more and submit your proposal here:

blog.jupyter.org/jupyter-comm...

Your Ideas, Our Support: Jupyter Community Call For Funding Proposals The Jupyter Executive Council and Jupyter Foundation are pleased to announce a call for proposals for the Jupyter community. Visit the…

Have a great idea for Project Jupyter? We want to help you build it! 🚀

The Jupyter Foundation is now accepting funding proposals from all community members. This is your chance to make a direct impact. Learn how to apply! 👇

blog.jupyter.org/your-ideas-o...

👋 JupyterLab and Jupyter Notebook users:

What's one thing you'd love to see improved in JupyterLab, Jupyter Notebook, or JupyterLite?

The team is prepping the upcoming 4.5/7.5 releases and wants to tackle some usability issues.

Drop your feedback below, this will help prioritize what gets fixed!👇

YouTube video by Jeremy Tuloup What's new in JupyterLab 4.4 and Notebook 7.4?

JupyterLab 4.4 and Jupyter Notebook 7.4 will be available very soon.

And they are coming with a couple of nice improvements and bug fixes 🎁

So I just published a new video to do a quick tour of these new features 🎥

www.youtube.com/watch?v=YhYo...

The option to change console prompt position is available under the three dots button in the console toolbar, which is the last toolbar button

Toggling all the three new settings transforms the console into a single cell

The Import and Export buttons in the Settings Editor are the first two items in the toolbar panel

The workspace indicator in the open state

JupyterLab 4.4.0b1 and Notebook 7.4.0b1 are available for testing 🎉
- improved code console
- settings import/export
- better real time collaboration
- workspace indicator
- kernel subshells

Please test:

pip install --pre 'jupyterlab>=4.4.0b1'

or

pip install --pre 'notebook>=7.4.0b1'

The option to change console prompt position is available under the three dots button in the console toolbar, which is the last toolbar button

Toggling all the three new settings transforms the console into a single cell

The Import and Export buttons in the Settings Editor are the first two items in the toolbar panel

The workspace indicator in the open state

JupyterLab 4.4.0b1 and Notebook 7.4.0b1 are available for testing 🎉
- improved code console
- settings import/export
- better real time collaboration
- workspace indicator
- kernel subshells

Please test:

pip install --pre 'jupyterlab>=4.4.0b1'

or

pip install --pre 'notebook>=7.4.0b1'

Simplifying and speeding up Binder builds with BuildKit The Binder Project allows users to build reproducible, sharable environments for interactive computing. To accomplish this, Binder uses a…

The Binder team recently made environment builds faster and simpler! Here's a post describing how: blog.jupyter.org/simplifying-...

Cloudy With a Chance of Jupyter Install JupyterHub on Azure in 30 Minutes With Nebari

Tired of complex cloud setups? Quansight's Nebari makes JupyterHub deployment a breeze. Scalable, secure, and ready in half an hour. Dive into the details: https://buff.ly/3WPvg7Y #Jupyter #OpenSource

The PR improving the JupyterLab code consoles has been merged, and is now available in the latest JupyterLab, Notebook and JupyterLite pre-releases!

➡️ pip install --pre jupyterlab notebook

💡We're working on making the new options available in the JupyterLite REPL, stay tuned! 💡

I don't know. I know you can install new versions of JupyterLab in environments and use them in JupyterLab Desktop even if JupyterLab Desktop comes with an old one bundled (this is how I use it). I will try to raise this issue in the Jupyter community.

Release v4.3.5 · jupyterlab/jupyterlab 4.3.5 (Full Changelog) Bugs fixed Fix scrolling and selection restoration on undo/redo #17158 (@krassowski) Fix windowing crash due to out-of-bounds access #17238 (@krassowski) Increase color cont...

#JupyterLab 4.3.5 is available. Includes fixes for:
- scroll restoration on undo/redo
- accessibility: color contrast and missing titles
- disabling fuzzy filtering in file browser
- general stability
- execution indicator restoration (for server-side execution)
github.com/jupyterlab/j... #jupyter

A notebook with the minimap opened in JupyterLite 0.5.0

JupyterLite 0.5.0 is now available🎉

This release is based on the latest JupyterLab 4.3 and Jupyter Notebook 7.3, and includes features such as the notebook minimap and a new "execute" config for the REPL 🎁

It also comes with a fix for better handling kernel restarts.

Enjoy!

Add Content Provider API by krassowski · Pull Request #17092 · jupyterlab/jupyterlab References Closes Allow a drive to support multiple document providers #16717 Builds on and supersedes Add content providers #16744 Together with Use content providers to remove RTC prefix jupyter...

RTC: prefix has been a roadblock in wider adoption of #jupyter collaboration as many extensions did not support it. The RTC prefix is no more thanks to content providers pioneered by @davidbrochart.bsky.social 🎉

To test it:

pip install --pre "jupyterlab>=4.4.0a2" "jupyter-collaboration>=4.0.0a0"

Persist — A JupyterLab Extension for Persistent Interactions Computational notebooks like JupyterLab have become indispensable tools, enabling seamless integration of code, visualizations, and text. However, modern notebooks limit the usefulness of interactions...

Persist: A fantastic JupyterLab extension (+ research paper) by Kiran Gadhave, Zach Cutler, and @alex-lex.bsky.social. Persist captures interaction provenance, making interactions persistent and reusable. 👏 More details on their blog post with code at vdl.sci.utah.edu/blog/2024/05.... 📊