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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!

Best Open-Weight LLMs by Memory Required (July 2026)

https://claude.ai/public/artifacts/4b74e194-a4b2-414f-a313-8d4b98a92b0b
2•yid•4m ago•0 comments

Coordination layer for AI coding agents, built on Git

https://github.com/zyads/loom-vcs
2•aether-zyads•5m ago•0 comments

An Introduction to Formal Logic(2020) [pdf]

https://logicmatters.net/ifl/pdfs/IFL2_LM.pdf
2•o4c•9m ago•0 comments

UK AISI / Caisi Preliminary Assessment of Kimi K3's Cyber Capabilities

https://www.nist.gov/news-events/news/2026/07/uk-aisi-caisi-preliminary-assessment-kimi-k3s-cyber...
2•walrus01•11m ago•0 comments

Why Do Autistic People Talk Like Animé Villains?

https://dispatchesfromtheautismwars.substack.com/p/why-do-autistic-people-talk-like
2•barry-cotter•12m ago•0 comments

Two Chinese win top Maths prize

https://www.bbc.com/news/articles/cvg84gp8xx4o
3•Alien1Being•25m ago•0 comments

The Productivity Mirage

https://frantic.im/mirage/
2•stopachka•26m ago•0 comments

US tech groups cut 140k jobs

https://www.ft.com/content/96a33881-27fd-42cf-8cff-4cbc87fc835f
4•Alien1Being•29m ago•0 comments

Corporate America Has Suddenly Decided to Stop Blowing Money on AI

https://www.wsj.com/business/china-us-ai-model-costs-53a12e96
3•Alien1Being•30m ago•2 comments

Escaping Claude Cowork's local VM sandbox via CVE-2026-46331

https://accomplish.ai/blog/sharedroot-escaping-claude-cowork-sandbox/
1•_orcaman_•34m ago•0 comments

Gatekeepers, Luddites, Haters and AI-Generated Maps

https://www.maproomblog.com/2026/07/gatekeepers-luddites-haters-and-ai-generated-maps/
1•ethagnawl•40m ago•0 comments

AI Agent Blameless Postmortem Template

https://cordum.io/blog/ai-agent-blameless-postmortem-template
1•ankitg12•41m ago•0 comments

The Discovery Problem: When AI Agents Build Tools No One Can Find

https://www.ixcoach.com/articles/the-discovery-problem-when-agents-build-invisible-tools
1•ankitg12•42m ago•0 comments

Points as Tori: Fast Pointwise Signed Distance for Point Clouds

https://nzfeng.github.io/research/PointsAsTori/
1•nill0•43m ago•0 comments

Opposing ICE Might Save the Country. It Could Also Ruin Your Life

https://www.wired.com/story/opposing-ice-might-save-the-country-could-also-ruin-your-life/
9•willmarch•45m ago•2 comments

C64 Online

https://c64online.com/
2•ibobev•53m ago•0 comments

Speculative Decoding: The Free Speed Toggle Your Local LLM Is Probably Not Using

https://vettedconsumer.com/speculative-decoding-explained-the-free-speed-toggle-your-local-llm-is...
2•ermantrout•1h ago•0 comments

Lightcone Commons

https://thezvi.substack.com/p/introducing-lightcone-commons
1•paulpauper•1h ago•0 comments

Reusing Buffers in Multicore OCaml

https://gazagnaire.org/blog/2026-07-24-domain-safe-codecs.html
1•matt_d•1h ago•0 comments

Sandyne DAW – Write, record and mix your own music (Free preview)

https://sandyne.com/
2•dr_kiszonka•1h ago•0 comments

US Blocks SSL Security Certificates for Iran's Fars News Agency

https://thecradle.co/articles-id/38859
3•SanjayMehta•1h ago•3 comments

Cage-lite:Prebind assurance for consequential AI agent actions

https://github.com/roopamwsure/cage-lite
1•roopamsure10•1h ago•0 comments

How Chinese tech and Russian tactics are aiding Iran's bombing of US bases

https://www.theguardian.com/world/2026/jul/24/irans-much-improved-missile-systems-pose-a-real-thr...
2•0in•1h ago•0 comments

Km/h and only traffic tickets? What gives?

https://kylaleelawyer.substack.com/p/230-kmh-and-only-traffic-tickets
1•kylaleelawyer•1h ago•1 comments

Alain Bombard

https://en.wikipedia.org/wiki/Alain_Bombard
2•thunderbong•1h ago•0 comments

Netflix Has to Evolve

https://www.theguardian.com/media/2026/jul/24/netflix-evolve-binge-watch-era-end
1•andsoitis•1h ago•0 comments

For only third time ever, a woman shares math's top prize

https://www.washingtonpost.com/science/2026/07/23/fields-medal-winners-include-woman-mathematicia...
2•MilnerRoute•1h ago•0 comments

Hyundai claims humanoid robot plan is not part of talks with striking workers

https://arstechnica.com/ai/2026/07/hyundai-claims-humanoid-robot-plan-is-not-part-of-talks-with-s...
2•loughnane•1h ago•0 comments

Check Out the Bubbles

https://shojiwax.com/2026/07/24/check-out-the-bubbles/
2•ghssds•1h ago•0 comments

Fighting Cancer (2016)

http://hintjens.com/blog:123
2•gurjeet•1h ago•0 comments