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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!

Polyethylene Upcycling to Liquid Alkanes in Molten Salts

https://pubs.acs.org/jacsat/article-abstract/147/19/16207/3737030/Polyethylene-Upcycling-to-Liqui...
1•bilsbie•24s ago•0 comments

D1: Liquid AI's First Decision Model

https://docs.liquid.ai/lfm/models/decision-models
1•mfiguiere•51s ago•0 comments

That About Wraps It Up for Stock Mac UI

https://inessential.com/2026/09/22/that-about-wraps-it-up-for.html
1•pavel_lishin•2m ago•0 comments

Is Claude Conscious? Inside Anthropic's Quest to Instill Morality into Its AI

https://www.nytimes.com/2026/09/29/us/anthropic-claude-morals-ai.html
1•sbulaev•3m ago•0 comments

The Record Does Not Change: what a verifiable record of AI-agent work costs

https://appendonly.ai/
1•adrianoutlaw•3m ago•0 comments

America.gov Uses Grok and Gemini

https://www.cnbc.com/2026/09/29/trump-ai-gemini-grok.html
1•DearAll•5m ago•0 comments

EmDash reaches version 1.0 (open source CMS for Astro)

https://emdashcms.com/blog/emdash-1-0
2•fallinditch•7m ago•0 comments

The (Nvidia) DGX Spark Handbook

https://huggingface.co/blog/exolabs/the-dgx-spark-handbook
1•kristianpaul•8m ago•0 comments

Internal emails show Facebook split over fake news plea from Sacha Baron Cohen

https://www.fastcompany.com/91613679/fake-news-sacha-baron-cohen-sheryl-sandberg-facebook
2•johnshades•9m ago•0 comments

Data Is the Application · Ma.ttias.be

https://ma.ttias.be/data-is-the-application/
1•abdelhousni•11m ago•0 comments

Show HN: Clx 0.4.0 – native compiler for Lua

https://samyeyo.github.io/clx/
1•_samt_•11m ago•0 comments

Ask HN: Will Anthropic release $500 plan too?

1•pranshuchittora•11m ago•0 comments

McDonald's push to have AI price your Big Mac

https://www.cnbc.com/2026/09/29/inside-mcdonalds-push-ai-price-big-mac.html
2•Betelbuddy•11m ago•0 comments

Americans will be able to apply for their first passport online in 2027

https://twitter.com/StateDept/status/2104957106655023491
1•atestu•12m ago•0 comments

Trump says he and tech leaders signed AI agreement that is 'morally binding'

https://www.cnbc.com/2026/09/29/tech-white-house-ai-lunch-trump.html
4•Betelbuddy•13m ago•1 comments

No Hate in Homelab – know the record before HomelabFest

https://nohateinhomelab.com/geerling/
1•louwrentius•14m ago•0 comments

Turn off and restrict access to Apple Intelligence features on Mac

https://support.apple.com/en-in/guide/mac-help/mchlb2e44f94/mac
1•dantondwa•15m ago•0 comments

Why Dario Amodei was the notable absentee from Trump's dinner with Xi

https://www.businessinsider.com/tech-leaders-join-donald-trump-dinner-with-xi-jinping-2026-9
2•mathieu_aithos•16m ago•0 comments

Are new OpenAI models getting better for coding?

https://developer.microsoft.com/blog/what-ai-benchmarks-are-not-telling-you/
2•Zeruxe•21m ago•3 comments

Abusing the iPhone Duo Hinge API to Play Flappy Bird

https://quarters.captaintouch.com/blog/posts/2026-09-29-abusing-the-iphone-duo-hinge-api-to-play-...
1•capitain•21m ago•0 comments

I built a Helm plugin because tracking values was driving me crazy

https://github.com/aboodcs/helm-valuetrace
1•x59lk•21m ago•0 comments

AI safety advocates sue OpenAI over Hugging Face hack under CA anti-hacking law

https://www.politico.com/news/2026/09/29/advocates-sue-openai-over-hugging-face-hack-with-califor...
4•dwohnitmok•25m ago•0 comments

Resistance to AI Gathers Strength

https://english.elpais.com/technology/2026-09-21/resistance-to-ai-gathers-strength.html
2•Betelbuddy•25m ago•0 comments

Build the harness before you hand the agent real work

https://matthewboston.com/blog/build-the-harness-before-you-hand-the-agent-real-work.html
1•bostonaholic•26m ago•0 comments

Trump says he'll order AI be renamed 'super intelligence' after meeting execs

https://www.cnn.com/2026/09/29/business/amodei-huang-karp-trump
2•pseudolus•26m ago•0 comments

Pentagon DMDC data breach exposes records of over 3M people

https://beinsure.com/news/pentagon-dmdc-data-breach-exposes-records-of-over-3-mn-people/
2•Beinsure•27m ago•1 comments

Show HN: Coding agent agnostic voice meta harness

https://github.com/CakeCrusher/full_duplex_code
1•SebastianSosa•28m ago•0 comments

How El Niño Made the Atlantic Hurricane Season Disappear

https://www.wsj.com/us-news/climate-environment/how-el-nino-made-the-atlantic-hurricane-season-di...
5•atestu•29m ago•2 comments

Anthropic warns AI may pose 'existential risks to humanity' in IPO filing

https://www.reuters.com/business/finance/anthropic-warns-ai-may-pose-existential-risks-humanity-i...
1•moonlighter•29m ago•0 comments

The CIA Killed Him. The Navy Blamed My Friend

https://theiceman.substack.com/p/the-cia-killed-him-the-navy-blamed
3•johnshades•30m ago•0 comments