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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!

A Brief History of Life

https://sites.psu.edu/gopalan/curiosity-corner/light/
1•suopspaces•1m ago•0 comments

World model companies are keeping a lot of secrets

https://techcrunch.com/2026/09/20/world-model-companies-are-keeping-a-lot-of-secrets/
1•ent101•8m ago•0 comments

AI is breaking the academic sorting machine

https://lemire.me/blog/2026/09/20/ai-is-breaking-the-academic-sorting-machine/
1•chmaynard•9m ago•0 comments

A Fresh Start: My Minimalist Blog Redesign After 14 Years

https://bcastell.com/posts/a-fresh-start/
1•Breakthrough•9m ago•0 comments

Reviving Deserts with Syntropic Agroforestry

https://wikifarmer.com/library/en/article/reviving-deserts-with-syntropic-agroforestry
1•lawrenceyan•10m ago•0 comments

Delta (zed.dev) – Help understanding ToS

https://zed.dev/terms#41-zeds-use-of-customer-data
2•maxpicklez•11m ago•1 comments

Can I Let My AI Agent Run on Shabbat?

https://www.chabad.org/library/article_cdo/aid/7288064/jewish/Can-I-Let-My-AI-Agent-Run-on-Shabba...
3•some-guy•12m ago•0 comments

Deterministic grounding checks for LLM agents, no LLM in the hot path

https://github.com/polarisbuiltinc-wq/ora-grounding
1•tjsandhu•14m ago•0 comments

When Intelligence Becomes Abundant, Architecture Becomes the Constraint

https://henrymurphy832344.substack.com/p/when-intelligence-becomes-abundant
1•hmurphy100•14m ago•0 comments

Deterministic Core, Non-Deterministic Shell

https://outdata.net/blog/260803
1•brandon_bot•15m ago•1 comments

Fluid Simulation in One Tweet

https://davidar.io/post/fluid
1•E-Reverance•15m ago•0 comments

Why Bother with Lint Rules If AI Writes the Code?

https://allstead.dev/blog/why-lint-when-ai-writes-the-code
1•willio58•21m ago•3 comments

The Great Gatsby

https://calmscroll.com/the-great-gatsby-f-scott-fitzgerald
1•amadeuspagel•24m ago•0 comments

Canada and France to Develop Space Systems

https://www.bloomberg.com/news/articles/2026-09-20/canada-france-to-develop-shared-space-launch-i...
1•Teever•28m ago•0 comments

Open Radar Code Architecture

https://orca.radioglaciology.com/
2•toomuchtodo•37m ago•1 comments

Applesauce: Transparent Compression for Apple File System Compression (AFSC)

https://github.com/Dr-Emann/applesauce
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Jev – System-1 Agent Architecture Radar (open-source)

https://github.com/logicrw/awesome-jev-projects
2•noobplus•41m ago•0 comments

Nobel economists throw support behind California billionaire tax

https://www.ft.com/content/94ec0fee-53ab-4d7e-9b17-6b05608ad974
5•paulpauper•42m ago•0 comments

UK productivity grew twice as fast as thought after 2008 financial crisis

https://www.ft.com/content/560fc2ad-5c7e-4878-ae9b-a3183004c394
1•paulpauper•42m ago•1 comments

Jevcache

https://jevcache.sh/
2•handfuloflight•43m ago•0 comments

Victor Hugo Helped Save the Notre-Dame

https://news.artnet.com/art-world/art-bites-victor-hugo-notre-dame-2802365
2•ohjeez•43m ago•1 comments

ZCode: Z.ai's coding agent harness. Powerful, intelligent, extensible

https://github.com/zai-org/ZCode
1•doppp•49m ago•0 comments

Flock Partnered with Nonprofit That Uses AI to Rally Public Support

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3•dp-hackernews•54m ago•0 comments

How to Post Train

https://howtoposttrain.com/
1•Nischalj10•58m ago•0 comments

A study of sequence weighting at scale

https://blog.janestreet.com/a-study-of-sequence-weighting-at-scale/
2•eatonphil•59m ago•0 comments

How Google is drafting AI chatbot laws around the country

https://www.npr.org/2026/09/18/nx-s1-5968878/ai-chatbots-safety-regulation-google
1•andsoitis•1h ago•0 comments

Giveaway Bot Services

https://discord.com/oauth2/authorize?client_id=1547251904277651578&permissions=4503599627783232&i...
1•jotajx•1h ago•0 comments

Nvidia's Jensen Huang rejects AI extinction warnings as "doomsday narratives"

https://www.cbsnews.com/news/jensen-huang-nvidia-rejects-ai-extinction-warnings/
4•AlexDragusin•1h ago•3 comments

ReBarUEFI: Resizable BAR for almost any UEFI system

https://github.com/xCuri0/ReBarUEFI
1•nateb2022•1h ago•0 comments

OpenAI Sees Burning Through $278B by 2030: FT

https://www.bloomberg.com/news/articles/2026-09-18/openai-projects-burning-through-278-billion-by...
3•sbulaev•1h ago•2 comments