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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•1y 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!

MacFileSizing – What is consuming my disk space?

https://github.com/jaccon/macfilesizing/tree/main
1•jaccon•2m ago•0 comments

Anthropic CEO says AI swarm could 'take over the Internet' in 6-12 months

https://venturebeat.com/security/anthropic-ceo-says-ai-swarm-could-take-over-the-entire-internet-...
2•pseudolus•8m ago•0 comments

Show HN: Aqqai – Every answer, checked before you see it

https://demo.aqqai.in
1•Vineetyadav2•12m ago•1 comments

Kubernetes v1.37 brings 67 enhancements. Which matter for operators?

https://thenewstack.io/kubecon-kubernetes-updates-security/
1•geoffbp•13m ago•0 comments

Every invoice in Brazil's economy runs on SOAP 1.2. We mapped it all

https://github.com/stoix-dev/sefaz-webservices-postman
1•lestx•14m ago•0 comments

The Succession Crisis That Tore England Apart

https://www.historytoday.com/archive/feature/succession-crisis-tore-england-apart
1•pepys•15m ago•0 comments

Aligned to Whom?

https://hyperbo.la/w/aligned-to-whom/
1•lopopolo•17m ago•0 comments

After Math

https://terrytao.wordpress.com/2026/09/12/after-math/
1•throwaway81523•17m ago•0 comments

Ask HN: How can DigitalOcean not afford $50, but can afford $3M to Omarchy?

5•dpmartinez•25m ago•0 comments

Backflip: Apple now wants to train AI models with user data after all

https://www.heise.de/en/news/Backflip-Apple-now-wants-to-train-AI-models-with-user-data-after-all...
1•jacquesm•25m ago•0 comments

Show HN: Astah Pro MCP – Enabling AI-Powered UML Modeling

https://github.com/takaakit/astah-pro-mcp
1•takaakit•26m ago•0 comments

Physicist does the math on Star Trek's "Picard maneuver"

https://arstechnica.com/science/2026/09/physicist-does-the-math-on-star-treks-picard-maneuver/
1•kensai•28m ago•0 comments

Code is free speech (2020)

https://hoffmang9.github.io/free-speech/the-history-code-is-free-speech.html
1•tehlike•33m ago•1 comments

Tim Berners-Lee: I'm interested in Math-what stuff don't we do in School?

https://www.w3.org/People/Berners-Lee/Kids.html
1•nxobject•33m ago•0 comments

U.S. agencies say top Chinese AI companies systematically copied American models

https://www.nbcnews.com/tech/tech-news/us-accuses-china-ai-developers-deepseek-alibaba-copying-am...
1•pseudolus•37m ago•0 comments

Trade war puts spotlight on Canada's relationship with US tech

https://www.cbc.ca/radio/justasking/canada-digital-sovereignty-just-asking-9.7337778
1•pseudolus•38m ago•0 comments

Biggest AI Rivals Agree They Need to Slow It Down

https://www.wsj.com/tech/ai/anthropic-boss-warns-ai-industry-must-slow-the-pace-a4267b56
1•bryan0•38m ago•0 comments

An interesting anecdote from our Hacker Opus work

https://www.lesswrong.com/posts/HE3Styo9vpk7m8zi4/evhub-s-shortform?commentId=fcqxeya5TCnbx5YBa
1•yurivish•39m ago•0 comments

The Interim Computer Museum

https://icm.museum/
23•mulmen•50m ago•4 comments

Apple *deletes* your Apple Music library if you unsubscribe

https://www.reddit.com/r/apple/comments/7niv58/fyi_apple_deletes_your_apple_music_library_if_you/
8•behnamoh•51m ago•2 comments

Can an earnest agreement with AI increase alignmnet. appears to be "YES "

https://www.echohive.ai/a-short-agreement-zero-observed-cheating
2•echohive42•59m ago•0 comments

A Dick Smith VZ200 without the Dick Smith

http://oldvcr.blogspot.com/2026/09/a-dick-smith-vz200-without-dick-smith.html
3•classichasclass•1h ago•0 comments

Don't call yourself an artisanal programmer

https://purplesyringa.moe/blog/dont-call-yourself-an-artisanal-programmer/
4•emschwartz•1h ago•3 comments

Professor Leonard is back [video]

https://www.youtube.com/watch?v=bIQZ6yahKJk
4•mindcrime•1h ago•1 comments

35 Years of Momentum – Troy Howard

https://blog.thoward37.me/articles/35-years-of-momentum/
4•thoward37•1h ago•2 comments

I was so frustrated with GitHub that I rebuilt it as a Chrome extension

https://gitquiet.com/
4•sasha_zelts•1h ago•1 comments

Don't Trust the Super-App: A Case Study of Russia's Max

https://arxiv.org/abs/2609.11814
3•sbulaev•1h ago•0 comments

Show HN: Open-Sourced Chrome Extension to Save, Organize and Switch Bookmarks

https://github.com/ringlochid/leotabs
6•ringlochid•1h ago•0 comments

>10x More Efficient Pretraining

https://magic.dev/blog/pretraining
2•gmays•1h ago•0 comments

Carissa Véliz: Beware the power of prediction [video]

https://www.ted.com/talks/carissa_veliz_beware_the_power_of_prediction
2•Anon84•1h ago•0 comments