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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!

CVE-2026-86950: An in-the-wild iOS bug with a possible WhatsApp zero-click path

https://calif.io/research/the-great-glyph-grift
1•ni5arga•1m ago•0 comments

Ban Kids from Social Media and They'll Chat in Public Radio Podcast Comments

https://www.techdirt.com/2026/09/30/ban-kids-from-social-media-and-theyll-just-chat-in-public-rad...
1•hn_acker•2m ago•2 comments

LLM library that builds itself, a converter for nearly every file

https://medium.com/@vektormemory/vektor-v1-9-8-b023b9b8a654
1•vektormemory•4m ago•0 comments

Thinking Before Thinking: Scaling Agentic Inference Through Meta-Reasoning

https://arxiv.org/abs/2609.38147
1•matt_d•5m ago•0 comments

Factory CEO just accused his VC board advisor of spying for Cognition

https://techcrunch.com/2026/09/30/factory-ceo-just-accused-his-vc-board-advisor-of-spying-for-cog...
2•reenorap•9m ago•0 comments

Model with metacognitive guidance identifies zero-click full-chain RCE in BlueZ

https://twitter.com/autopoiesislab/status/2083221810171224416
1•car•9m ago•0 comments

AI as a Compiler: Compiling Triton kernels without the Triton compiler

https://arxiv.org/abs/2609.36800
1•matt_d•10m ago•0 comments

The data center buildout, county by county

https://pressaudit.org/blog/datacenters
1•SLHamlet•10m ago•1 comments

Can Agents Design Libraries for Agents?

https://gabeorlanski.github.io/posts/library-design-bench/
1•matt_d•14m ago•0 comments

Scott Aaronson interview, on the impact of AI on science and mathematics [video]

https://www.youtube.com/watch?v=Qjgc9Hs5GKs
1•calf•14m ago•1 comments

How many hats are in the world?

https://hat.observer/
1•civilchaos•15m ago•0 comments

Context Language Models (CLMs)

https://github.com/facebookresearch/context-language-models
1•handfuloflight•16m ago•0 comments

Apple's first employee: The remarkable odyssey of Bill Fernandez (2014)

https://www.techrepublic.com/article/apples-first-employee-the-remarkable-odyssey-of-bill-fernandez/
1•bananaboy•18m ago•0 comments

Configurable Indent Levels?

https://github.com/psf/black/issues/378
1•jerlendds•21m ago•0 comments

EDG C++ Compiler is open source

https://github.com/edgcpp/compiler
2•zx2c4•22m ago•0 comments

The Scientific Case for Being Less in Touch with Your Friends

https://www.nytimes.com/2026/09/30/opinion/friendship-frequency-interaction.html
1•gumby•27m ago•0 comments

Google figures out how to watermark AI-designed proteins

https://arstechnica.com/science/2026/09/google-figures-out-how-to-watermark-ai-designed-proteins/
3•gumby•28m ago•1 comments

Readable Regular Expressions for JavaScript/TypeScript, Inspired by Emacs' Rx

https://rahuljuliato.com/posts/emacs-rx-in-typescript
1•RahulMJ•33m ago•1 comments

Building big things in the U.S. is hard. A Senate deal aims to fix that

https://www.washingtonpost.com/politics/2026/09/30/building-big-things-us-is-too-hard-senate-deal...
2•scythe•35m ago•0 comments

OpenJDK vs. GraalVM vs. Eclipse Temurin vs. Semeru Java Performance

https://www.phoronix.com/review/openjdk-graalvm-temurin-semeru
1•ejboy•36m ago•0 comments

The AI Pascal's Wager

https://ploum.net/2026-10-01-pascal_wager.html
2•frizlab•38m ago•1 comments

Growth.engineer – Vetted, open-source growth workflows for AI agents

https://www.growth.engineer
1•Soerensen•38m ago•1 comments

Nine – single binary, WASM tools and persistent AI harness/runtime

https://github.com/djordlucas/nine
1•jojolatulipe•45m ago•1 comments

How to Calibrate Jev (and Related)

https://pypi.org/project/reexpress-sdm/
1•reexpressionist•53m ago•0 comments

Turbo Haskell

https://www.reddit.com/r/haskell/comments/1wu24oe/turbo_haskell/
9•simonmic•59m ago•0 comments

Stacking Oranges in 24 Dimensions

https://www.empirical.health/blog/ai-math-sphere-packing/
1•brandonb•59m ago•0 comments

Rivian: LiDAR R2 reaches customers in 2027, employees get it this year

https://electrek.co/2026/09/30/rivian-lidar-r2-customers-2027-autonomy-update/
3•cisc•1h ago•0 comments

56k.rip – the 1996 dial-up internet experience

https://56k.rip/
2•adunk•1h ago•0 comments

Automating Wi-Fi setup testing on the ESP32

https://groundrun.io/blog/automating-wi-fi-setup-testing-on-the-esp32/
6•adunk•1h ago•0 comments

MailDeskt v1.4.0 – A simple, fast desktop inbox for Resend, Gmail, Outlook, more

https://www.maildeskt.com/
1•jimmy_lee•1h ago•0 comments