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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•12mo 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!

We Ran 250 AI Agent Evals to Find Out If Skills Beat Docs

https://www.wix.engineering/post/we-ran-250-ai-agent-evals-to-find-out-if-skills-beat-docs-the-an...
2•doppp•2m ago•0 comments

Adults relive the musical camaraderie of their youth at band camps for grown-ups

https://apnews.com/article/summer-band-camps-adults-music-fc09ccf0261bec0007f5e3b2ebc3570e
1•petethomas•13m ago•0 comments

Speed Month – The Reader Meets the Fediverse

https://activitypub.blog/2026/05/05/radical-speed-month-the-reader-meets-the-fediverse/
1•ZacnyLos•16m ago•0 comments

Evolvable AI: are we on the brink of the next major evolutionary transition?

https://www.technology.org/2026/05/12/evolvable-ai-are-we-on-the-brink-of-the-next-major-evolutio...
1•ninjahawk1•16m ago•0 comments

Founding AI Video Engineer – Remote

https://www.boomshare.ai
1•matalonia•18m ago•0 comments

Veteran network architect proposes IPv8 – to improve IPv4, not leapfrog v6

https://www.theregister.com/networks/2026/05/12/veteran-network-architect-proposes-ipv8-to-improv...
2•TowerTall•18m ago•0 comments

Unitree unveils a manned transformable mecha, from $650k [video]

https://www.youtube.com/watch?v=oWOyUMJWptc
2•arczyx•18m ago•0 comments

Bach – BWV245 – BachStiftung [video] (2022)

https://archive.org/details/bach-st-john-passion-choir
1•petethomas•25m ago•0 comments

Agent View in Claude Code

https://claude.com/blog/agent-view-in-claude-code
1•pretext•26m ago•0 comments

Octopus

https://www.octopus.ac
1•jruohonen•28m ago•1 comments

Satya Nadella: "I don't want to be IBM and OpenAI to be Microsoft" (2022)

https://twitter.com/TechEmails/status/2053971603214766214
2•mfiguiere•28m ago•0 comments

How and Why I Journal

https://jan.miksovsky.com/posts/2026/05-11-journaling
-10•OuterVale•32m ago•3 comments

PagerDuty Appoints John DiLullo as CEO

https://www.pagerduty.com/newsroom/pagerduty-john-dilullo/
1•mads_quist•33m ago•0 comments

Deipnosophistae

https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Athenaeus/home.html
1•andsoitis•37m ago•0 comments

Tens of thousands of pedophiles operate in Israel every year

https://www.jpost.com/israel-news/tens-of-thousands-of-pedophiles-operate-in-israel-every-year-63...
6•rdevilla•41m ago•1 comments

Reddit Starts Blocking Mobile Website, Pushing Users to App Instead

https://old.reddit.com/r/technology/comments/1ta2xrk/reddit_starts_blocking_mobile_website_pushing/
8•thm•44m ago•0 comments

Daybreak

https://openai.com/daybreak/
2•soheilpro•47m ago•0 comments

Sony's Metamorphosis: HDTV Demo Laserdisc (1990) [video]

https://www.youtube.com/watch?v=YW26YMe8iUQ
1•nxobject•57m ago•0 comments

Sweden is the first country in the world prescribed by doctors

https://visitsweden.com/the-swedish-prescription/
2•giuliomagnifico•58m ago•0 comments

The Software Layer of China-US Tech Diplomacy

https://thediplomat.com/2026/05/the-software-layer-of-china-us-tech-diplomacy/
5•billybuckwheat•58m ago•0 comments

Soul.md

https://3798.substack.com/p/soulmd
1•abhis3798•58m ago•0 comments

Byron Allen Is Buying BuzzFeed, Will Become CEO

https://variety.com/2026/digital/news/byron-allen-buying-buzzfeed-ceo-1236745206/
2•thm•1h ago•0 comments

Lojban

https://en.wikipedia.org/wiki/Lojban
1•AbstractPlay•1h ago•0 comments

Claude Code and Blender MCP

https://hydroxide.dev/articles/blender-mcp-claude-code/
2•nmfisher•1h ago•0 comments

Screenshots of Old Desktop OSes

http://www.typewritten.org/Media/
6•adunk•1h ago•1 comments

I tried building AI agents and ended up needing an institution

https://github.com/wes-zheng/ai_institutions
2•bbcf•1h ago•0 comments

Rendering the Sky, Sunsets, and Planets

https://blog.maximeheckel.com/posts/on-rendering-the-sky-sunsets-and-planets/
1•bj-rn•1h ago•0 comments

Google Search Is Down

https://www.google.com/search?q=test
20•recklesspigeon•1h ago•13 comments

Show HN: Tessera – Turn coding agent sessions into structured work

https://github.com/horang-labs/tessera
1•horanglabs•1h ago•0 comments

Skymizer's chip design could embarrass Nvidia and AMD cards

https://www.techradar.com/pro/tiny-company-steals-amds-thunder-and-challenges-nvidia-with-old-tec...
3•anticensor•1h ago•0 comments