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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•11mo 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!

Humanoid Robots Are Still a Body Problem with Jerry Pratt [video]

https://www.youtube.com/watch?v=fsPDZjWMKMs
1•thunderbong•3m ago•0 comments

Meta stock drops on quarterly results 'internet disruptions' user numbers down

https://www.cnbc.com/2026/04/29/meta-q1-earnings-report-2026.html
1•1vuio0pswjnm7•7m ago•0 comments

In Backlash Against Tech in Schools, Parents Are Winning Rollbacks

https://www.nytimes.com/2026/04/29/technology/parents-school-tech-backlash.html
2•1vuio0pswjnm7•10m ago•0 comments

Tourist dies after being bitten at snake show while on vacation in Egypt

https://www.cnn.com/2026/04/28/africa/tourist-dies-snake-bite-egypt-scli-intl
1•fortran77•11m ago•0 comments

OpenAI, Sam Altman Hit with Slate of Lawsuits over Mass Shooting Canadian School

https://www.law.com/therecorder/2026/04/29/openai-sam-altman-hit-with-slate-of-lawsuits-over-mass...
1•1vuio0pswjnm7•12m ago•0 comments

Infrastructure Spend in the AI Era

https://redmonk.com/sogrady/2026/04/29/infrastructure-spend-in-the-ai-era/
1•mooreds•12m ago•0 comments

The Harmful Consequences of the Robustness Principle (2018)

https://datatracker.ietf.org/doc/html/draft-thomson-postel-was-wrong-03
1•Tomte•13m ago•0 comments

AMS – Detect unsafe LLMs in 30 seconds via activation analysis

https://github.com/GoogleCloudPlatform/activation-model-scanner
1•gmessenger•15m ago•0 comments

Fanspeak (1999)

https://www.fantasymaps.com/stuff/fanspeak.html
1•ipnon•16m ago•0 comments

Operation Sundevil (1990)

https://en.wikipedia.org/wiki/Operation_Sundevil
1•rickcarlino•22m ago•0 comments

Stablecoin Reserve Race: Brazil Pix, Morgan Stanley, OCC Charters

https://stablecoinbrief.substack.com/p/stablecoin-reserve-race-brazil-pix
1•knivef•28m ago•0 comments

Building agents that reach production systems with MCP

https://claude.com/blog/building-agents-that-reach-production-systems-with-mcp
1•gmays•33m ago•0 comments

Biology is a Burrito: A text- and visual-based journey through a living cell

https://burrito.bio/essays/biology-is-a-burrito
19•the-mitr•47m ago•2 comments

Can LLMs create lasting flashcards from readers' highlights?

https://memory-machines.com/report/
1•jryio•48m ago•0 comments

The Arpanet Reconstruction Project

https://obsolescence.dev/arpanet_home.html
2•ecliptik•49m ago•0 comments

Where the Goblins Came From

https://openai.com/index/where-the-goblins-came-from/
111•ilreb•51m ago•35 comments

Demonstrating the idea of gamma camera imaging [video]

https://www.youtube.com/watch?v=PyGlHtvihXA
5•num42•52m ago•0 comments

Ernie 5.1 Preview

https://ernie.baidu.com/
3•qainsights•54m ago•0 comments

Strait of Hormuz Daily Intelligence

https://insights.windward.ai/
3•jnord•56m ago•0 comments

LFM2-24B-A2B: Scaling Up the LFM2 Architecture

https://www.liquid.ai/blog/lfm2-24b-a2b
2•nateb2022•56m ago•0 comments

Finetuning Activates Verbatim Recall of Copyrighted Books in LLMs

https://github.com/cauchy221/Alignment-Whack-a-Mole-Code
18•reconnecting•1h ago•2 comments

Functional Programmers need to take a look at Zig

https://pure-systems.org/posts/2026-04-29-functional-programmers-need-to-take-a-look-at-zig.html
17•xngbuilds•1h ago•1 comments

Transponders to be installed on New York area airport ground vehicles

https://apnews.com/article/laguardia-plane-crash-air-canada-transponders-18578e94f2f7ec67b5ed45e9...
2•geox•1h ago•0 comments

GitHub Is Sinking

https://dbushell.com/2026/04/29/github-is-sinking/
5•xngbuilds•1h ago•1 comments

Opus 4.7's New Tokenizer: What It Costs

https://openrouter.ai/announcements/opus-47-tokenizer-analysis
4•vinhnx•1h ago•0 comments

Scroll-Driven Animations

https://www.joshwcomeau.com/animation/scroll-driven-animations/
2•vinhnx•1h ago•0 comments

AI Groupchats app just launched

https://techcrunch.com/2026/04/29/meet-shapes-the-app-bringing-humans-and-ai-into-the-same-group-...
2•nooriee•1h ago•1 comments

Show HN: Lssh – Terminal-native remote access suite for SSH and cloud targets

https://github.com/blacknon/lssh
2•blacknon•1h ago•1 comments

What is something you started and then wish you started earlier?

https://old.reddit.com/r/AskReddit/comments/1szjkl5/comment/oj2a8b7/
3•eeko_systems•1h ago•0 comments

I Choose Email over Messaging

https://www.spinellis.gr/blog/20250926/
3•fagnerbrack•1h ago•0 comments