alt.hn

7/22/2026 at 10:24:40 AM

Marimo now runs in PyCharm

 https://marimo.io/blog/pycharm

by cantdutchthis

7/24/2026 at 8:32:42 PM

We have adopted marimo notebook for doing modern data science. I’m happy with their progress. Nice to see greater integration.

by quinndupont

7/24/2026 at 10:02:42 PM

What’s “modern” data science?

by jdale27

7/25/2026 at 12:38:53 AM

The kind of data science that you do with marimo notebooks

by gathered

7/26/2026 at 12:47:43 AM

You're being facetious, right? How is it different from regular data science?

by jdale27

7/25/2026 at 4:17:32 AM

2-player games, 60 card decks, all sets are legal, no more than four of any card in each deck.

by jakeydus

7/25/2026 at 4:11:19 AM

Is the reload module very different than the base watch flag, and does the notebook editor use PyCharm/JetBrains' editor interfac, or is the notebook's editor completely embedded in PyCharm?

---

As usual on marimo posts I have to mention how much I enjoy the product:

Two weeks ago I was working on a large scale data reconciliation that was very high in complexity and high risk for correctness/accuracy.

I built a marimo notebook to interactively visualize and validate the final data, which lead to finding several edge cases that unit testing and validation queries alone would easily miss.

The notebook used tabbed controls for switching subviews, custom AnyWidget components for a few advanced filters, interactive Altair charts with reactive data selection for drilling-down, and tables to export examples to Google Sheets. So close to the full gamut of features I think.

The more traditional notebook or script based workflows would not have been sufficient, a well-organized reactive notebook saved a lot of time on iterating on components without losing data, and data without having to re-run the full notebook.

Big thanks to Akshay and team, you're doing awesome work! Genuinely this has improved my workflow.

by data-ottawa

7/25/2026 at 3:56:33 PM

The reloading mechanism in the blog exercises the module reloader (https://docs.marimo.io/guides/editor_features/module_autorel...), to reload other files (not the notebook file), which is different from the watch flag.

The current version of the extension embeds the marimo user interface in PyCharm. We may in the near future have a more native-feeling embedding, but that's a little tbd.

Glad to hear you're enjoying marimo, and thanks for sharing the anecdote. I'll gladly accept the "thank you", but it's worth mentioning this extension was developed end-to-end by Kiran :)

by akshayka

7/25/2026 at 5:17:30 AM

Any former Jupyter users using Marimo who have the sales pitch? I'm decently happy using Jupyter Lab but would love to hear what I'm missing out on

by rtpg

7/25/2026 at 6:25:12 AM

Yup! Not affiliated in anyway, just a fan. I like jupyter but marimo's my go to for a few reasons:

- Automatic reactivity can be turned on (will trigger dependent cells if you uptade an upstream one) - Much nicer non-json file format (just python files, with a seperate output) - Much better virtual environment integration / managent (this is always a hassle with jupyter) - Widgets are great! - Better LLM integration (new marimo-pair means llm can inspect the actual python runtime objects) - It generally "looks" a lot nicer if you're using the web ui, which is nice.

by benrutter

7/25/2026 at 10:24:42 AM

The cell DAG enforces that there’s no implicit state, which reduces cognitive load for me a lot and provides some pressure to abstract experimental code into functions. In Jupyter this is left to user discipline and restart-and-run-all workflow

The reactive components are also really nice for interactive plotting and exploratory data analysis. You can do this in Jupyter but it feels less seamless somehow. Interactive marimo workflow feels like streamlit but in a notebook interface

One thing I miss from Pluto.jl workflow is `let` for lowering friction for exploratory or plot cells. In marimo you have to name a `_` prefixed function and then call it which is better than nothing but not as clean as `let`. This is a minor complaint that’s more down to language features though

by rsfern

7/25/2026 at 5:32:30 AM

marimo dev here, the pitch that got me working there is widgets!

This video highlights some fancy tricks: https://www.youtube.com/watch?v=qVSeOr3AIbc

by cantdutchthis

7/25/2026 at 7:01:19 AM

this is a very engaging and well presented video, respect to whoever this guy who made it is (cant tell from the description), he's good at his job

by swyx

7/25/2026 at 8:18:24 AM

Vincent Warmerdam. Check out his PyData talks and the probably.ai YouTube channel for which he has done videos.

by mapam

7/25/2026 at 1:55:51 PM

Vincent D. Warmerdam ;) there are a bunch of Dutch people who otherwise have the same name.

People also know me from the calmcode youtube channel and https://calmcode.io website

by cantdutchthis

7/24/2026 at 9:56:40 PM

I fucking love marimo for exploring data.

However my use of it has decreased a little with how easily I can conjure disposable frontends with agents to explore one off things.

by msp26

7/24/2026 at 10:18:30 PM

You might like https://marimo.io/pair, it turns marimo into less of a notebook and more of a shared data/computational canvas for you and your agent

by akshayka

7/24/2026 at 11:26:13 PM

Last I heard, the feature was in beta so avoided it. But I'll definitely give it a go if it's mature now!

I have been using the --watch flag to let my agent play with the notebook as I use it already.

by msp26

7/24/2026 at 11:57:01 PM

Give it a shot, it's not in beta. It's much more powerful and fun to use than `--watch`. Works best with frontier models but is compatible with open source / local models too. If you have feedback please let me know!

by akshayka

7/25/2026 at 9:14:01 AM

Any support for windows/Powershell yet?

by nojito

7/25/2026 at 4:07:48 PM

stay tuned this week :)

by manzt

7/25/2026 at 3:58:58 AM

huh, I was doing this but without the feature. This is neat!

by red_hare

7/24/2026 at 10:24:20 PM

Why not make the agents make what you want with marimo?

by geraneum

7/24/2026 at 11:23:52 PM

I do that a decent chunk of the time yeah especially for learning. I also have a bunch of marimo notebooks that double as clis and they're lovely.

But sometimes I want to do something too specific or high fidelity and it's just easier to get the clanker to write typescript and make a webpage/components.

by msp26

7/25/2026 at 7:10:09 AM

Not sure about this environment complaint with Jupyter.

I taught venv and pip for years without issues to thousands.

Now I teach uv and it is even faster and easier.

by __mharrison__

7/25/2026 at 8:03:56 AM

As an SRE/ops (and I'm talking some years ago) it was often a pain point, especially with devs with a "works on my machine" attitude ; you would never get the exact requirements from them, I even saw a team of 2 who worked together with different versions of stuff on their respective machines. I also worked in some "offline" environments where once in prod you cannot pull anything from the internet, and you cannot install a compiler too, so it's quite hard to ship because some pip packages require to be built.

I found a way using (can't remember the tool name) which if you loop through the imports and gives it to the tool you get the package name, then I would build wheels to have all binaries and build a container or a VM with all that's needed, thus working completely around python package managers. This was a good enough workflow for the kind of deployment we needed.

Jupyter added a layer of complexity, I deployed it alongside RStudio as browser IDEs in docker swarm. Everybody wants a different set of deps and versions, so you have to keep track of everything, and also people may use things just for development that must not be shipped to prod, so you have to keep track of that too. Also some would develop notebooks on windows and expect them to work in linux VMs/containers and even in prod.

Nowadays devs ship container images anyway through a CI so it is less of an issue. In this era docker was far from being the de-facto everywhere, some people were still afraid of this, security didn't like it, etc.

by bionsystem

7/26/2026 at 7:13:34 AM

Wow. This is incredible.

This looks like a step up from Jupyter notebooks!

by pythonic_hell

7/24/2026 at 10:57:23 PM

I was interested in marimo, but I became less interested when I realized that they traded off being able to assign to a variable more than once in order to allow out-of-order execution of cells.

I mean as a Jupyter user, I typically do both and just keep track of what I'm doing in my head (like a repl with many snippets I can run any time), but if I wanted to make it more predictable, I would definitely give up out-of-order execution first.

by etbebl

7/24/2026 at 11:12:57 PM

I think that’s just a fundamental tradeoff though.

Being able to run Jupyter cells independently is a feature until it’s not.

I’d say for most of my one-off work, it’s fine. But for stuff I want to share it’s not.

by boron1006

7/25/2026 at 6:38:26 AM

Yes I understand it's a tradeoff, but I'm saying I would prefer a different tradeoff. It would be more intuitive to me if running a cell always invalidated the cells below; this would make variable reassignment unambiguous, just like in a script, but still with all the visualization goodies of a notebook.

by etbebl

7/25/2026 at 5:36:17 AM

marimo dev here.

Just wanted to mention that you're always able to do this:

for _x in range(100): ...

This way, `_x` is detected as a throwaway Python variable. And it won't re-appear in other cells.

Also, within the same cell you can always re-assign. But you can't do that in another cell. We want to ensure that a variable is fully declared in one, and only one, cell.

``` # cell A, totally fine

a = 1 for _ in range(100): a = a + 1

# but don't re-assign a in another cell. ```

by cantdutchthis

7/24/2026 at 9:28:16 PM

there are so many issues with jupyter notebooks and marimo solves none of them

by semiinfinitely

7/24/2026 at 10:03:36 PM

"Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something." - https://news.ycombinator.com/newsguidelines.html

It sounds like you're commenting about this from experience - if you'd like to share some of that, of course that would be welcome.

by dang

7/24/2026 at 10:03:07 PM

My biggest problem with Jupyter is hidden state. You have no idea what order the cells executed in and how many times to get to the current state. Pluto.jl and Marimo solve that by using reactivity to make state transparent. WYSIWYG.

I have also been thoroughly impressed how Marimo has engaged with AI agents. marimo-pair is fantastic.

by markkitti

7/25/2026 at 4:01:38 AM

What I like about Marimo notebooks over Jupyter:

1. They're just a python file so they work with python editors

2. There's no hidden state

3. I can import from them

4. I'm not accidentally committing base64 encoded image output anymore

by red_hare

7/24/2026 at 9:34:53 PM

Well, I've enjoyed it. It's easier to set up an run from a virtual environment than Jupyter notebooks. That was a big problem I had for years.

by cjohnson318

7/24/2026 at 9:44:20 PM

mind elaborate?

by dagi3d