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Show HN: Reaktiv – I built Excel-like reactive programming for Python

https://bui.app/when-frontend-reactivity-meets-backend-python-the-story-of-my-first-1-000-download-library/
2•buibuibui•6mo ago
Hi HN! I created Reaktiv, a Python library bringing reactive programming to the backend world that recently hit 1,000+ monthly downloads.

I'm actively promoting it because I believe signal-based reactivity (a concept that spread rapidly in frontend development) has huge untapped potential in Python. My breakthrough came when I stopped describing it as "Angular signals for Python" and started calling it "Excel-like computation graphs" - suddenly Python developers understood the value.

The library automatically tracks dependencies between computations, only recalculating values when dependencies change. This eliminates manual dependency tracking, prevents synchronization bugs, and reduces cognitive load when managing complex state.

Interestingly, I've noticed some initial interest from data scientists, though I'm still exploring what specific problems it might solve for them. I also believe the Home Assistant/IoT communities could benefit greatly from this approach.

Would love your thoughts on bringing frontend patterns to backend development!

I built 'Cursor for Ad Creatives' – Reverse-engineering ads using LLMs

https://www.magicmango.ai/en/blog/cursor-for-ad-creatives
1•lyorrei•5m ago•0 comments

Video Games Like Assassin's Creed Feed into Conspiracy Thinking

https://slate.com/culture/2025/11/video-games-assassins-creed-conspiracy-theory-epstein-qanon-med...
1•omnibrain•5m ago•0 comments

Europe's New War on Privacy

https://unherd.com/2025/11/europes-new-war-on-privacy/
1•joecobb•6m ago•0 comments

Show HN: A better Waze experience for your Tesla

https://www.teslanav.com/
1•ryanvogel•6m ago•0 comments

The Continuous Tensor Abstraction: Where Indices Are Real

https://arxiv.org/abs/2407.01742
1•ubasu•8m ago•0 comments

US War Dept's Big UFO Lie

https://www.overcomingbias.com/p/us-war-depts-big-ufo-lie
2•jger15•15m ago•2 comments

MX Master 4 killer? HP 785M/780M Ultra Fast Scrolling Review

https://www.jacopofranco.com/projects/hp-785m780m-ultra-fast-scrolling-review
1•jacopops•17m ago•0 comments

A simple waybar lyric module

https://github.com/rainaisntbald/waybar_lyrics
1•amadeuspagel•18m ago•0 comments

I built FREE infinite name generator and domain finder for side projects

https://proicon.ai/app/name-generator
1•Abod•21m ago•2 comments

Lumine: Building Generalist Agents in 3D Open Worlds

https://www.lumine-ai.org/
1•jauntywundrkind•22m ago•0 comments

FUTO: Keyboards Shouldn't Connect to the Internet

https://keyboard.futo.org/
2•ForHackernews•23m ago•1 comments

An ortographical typo in Zen of Python text (2008)

https://bugs.python.org/issue3364
1•susam•24m ago•0 comments

Stripe City – Black Friday/Cyber Monday Transactions in Real-Time

https://bfcm.stripe.com/
1•meetpateltech•24m ago•0 comments

Semantic Search over Text with NeuronDB

https://www.pgelephant.com/blog/neurondb-semantic-search-guide
1•pgelephant2025•31m ago•0 comments

Show HN: Nano PDF – A CLI Tool to Edit PDFs with Gemini's Nano Banana

https://github.com/gavrielc/Nano-PDF
13•GavCo•31m ago•2 comments

Joe Armstrong interviews Alan Kay (2016) [video]

https://www.youtube.com/watch?v=fhOHn9TClXY
4•kerim-ca•38m ago•0 comments

Arabic Time Words

https://arabic.desert-sky.net/time.html
1•marysminefnuf•40m ago•0 comments

AlphaFold Is Five Years Old – These Charts Show How It Revolutionized Science

https://www.nature.com/articles/d41586-025-03886-9
2•skx001•41m ago•0 comments

Unexpected events and prosocial behavior: the Batman effect

https://www.nature.com/articles/s44184-025-00171-5
1•atmosx•41m ago•1 comments

Tom Stoppard, playwright of dazzling wit and playful erudition, dies aged 88

https://www.theguardian.com/stage/2025/nov/29/tom-stoppard-playwright-of-dazzling-wit-and-playful...
2•mellosouls•46m ago•1 comments

Oxytocin boosts creativity, but only for approach-oriented people

https://www.psypost.org/oxytocin-boosts-creativity-but-only-for-approach-oriented-people/
2•DrierCycle•50m ago•0 comments

All it takes is for one to work out

https://alearningaday.blog/2025/11/28/all-it-takes-is-for-one-to-work-out-2/
55•herbertl•53m ago•25 comments

We've shipped a bunch of improvements to Macroscope over the last month

https://blog.macroscope.com/blog/changelog-november-2025
1•curiouska•54m ago•0 comments

Show HN: Experimental static AI coded website w/ Astro + tails for github pages

https://tariqdude.github.io/Github-Pages-Project-v1/
1•chiengineer•55m ago•1 comments

Show HN: I built a note-taking app with Markdown, images, and semantic search

https://app.notedown.xyz
1•5inGularity•56m ago•0 comments

Show HN: Free SDK changelog tracker with automatic daily updates

https://sdk-changelog-tracke-y3vn.bolt.host/
1•rokbenko•58m ago•0 comments

Ahead of the holidays, consumer and child advocacy groups warn against AI toys

https://www.npr.org/2025/11/20/nx-s1-5612689/ai-toys
1•1659447091•1h ago•0 comments

Baboon: Data Modeling with Automatic Evolutions and tagless binary codecs

https://github.com/7mind/baboon
2•pshirshov•1h ago•0 comments

A Visual Guide to How the Hong Kong Fire Spread

https://www.bbc.co.uk/news/resources/idt-c9792622-43e7-4b04-8374-2771dce4fcd1
5•skx001•1h ago•0 comments

Airbus issues major A320 recall due to software/radiation problem

https://www.reuters.com/business/aerospace-defense/airbus-issues-major-a320-recall-after-flight-c...
9•thundergolfer•1h ago•1 comments