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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!

AI cracked the Navier–Stokes challenge. What does that mean for physics?

https://www.nature.com/articles/d41586-026-02922-6
1•sbulaev•2m ago•0 comments

Machine Gods – the official podcast of the singularity

https://machinegods.fm/
1•flakiness•5m ago•0 comments

Cannabis Supply Chain Database

https://cannabis-supply-chain.pages.dev/
1•measurablefunc•7m ago•0 comments

AI insiders issue new warnings – including former Anthropic engineer Jacob Coxon

https://slashdot.org/story/26/09/17/2042242/ai-insiders-issue-new-warnings---including-former-ant...
1•MilnerRoute•7m ago•0 comments

Plan Advice in PostgreSQL 19

https://tapoueh.org/blog/2026/09/plan-advice-in-postgresql-19/
1•craigkerstiens•8m ago•0 comments

Prepare your iPhone 18 Pro Max to ship

https://support.apple.com/en-us/127848
3•ledoge•10m ago•0 comments

Bring back old Opus in Claude Code

https://osr.im/notes/claude-code-model-picker-older-opus/
1•osr00•11m ago•1 comments

Alibaba open-sources AI model that can detect cancer and nearly 150 conditions

https://www.scmp.com/tech/big-tech/article/3368055/alibaba-open-sources-medical-ai-model-can-dete...
2•yogthos•14m ago•0 comments

Swiss Federal Council Adopts the 2026 Security Policy Strategy

https://www.admin.ch/en/newnsb/zR3tvgIy1qIm
1•marcuschong•16m ago•0 comments

Jump N Bump

https://jumpnbump.net/
2•hefner1456•21m ago•0 comments

Show HN: Do your vitamins work?

https://www.supplementdex.com/supplement-checker
1•richarlidad•22m ago•1 comments

I've cross-examined a lot of humans, but never a supercomputer. Check it out

https://chatgpt.com/s/m_6aadcd183a3c819191c1d63e5804dce6
1•lawsuitllc•23m ago•0 comments

Show HN: Wcagent let use your ChatGPT subscription for coding

https://wcagent.ai/
1•losalah•23m ago•0 comments

Omarchy team started working on Qualcomm's Snapdragon platform support

https://omarchy.org/news/2026/09/introducing-omarchy-dragon/
3•machomaster•24m ago•0 comments

Wildlife corridor project is first Canadian finalist for Earthshot Prize

https://www.cbc.ca/news/science/y2y-earthshot-prize-finalist-9.7349898
2•BiraIgnacio•27m ago•1 comments

TypeSafe AI's Jev Is Not an LLM – and That May Be the Point

https://forkast.news/typesafe-ais-jev-is-not-an-llm-and-that-may-be-the-point/
1•Bluestein•29m ago•0 comments

AI-based learning is a joke

https://qlain.online/blog/ai-based-learning.html
1•etoql•30m ago•1 comments

What Is Synthetic Data Generation? A Simple Explainer

https://www.aptiv.com/en/insights/article/what-is-synthetic-data-generation
1•ohjeez•30m ago•0 comments

The Working Class Face a 'Class Ceiling' in Elite Occupations

https://www.nytimes.com/2026/09/18/business/class-barrier-academia.html
2•teachrdan•30m ago•2 comments

Show HN: StopReg – Email API for detecting disposable email and signup abuse

https://stopreg.com/
2•telim2•33m ago•0 comments

A New Risk for Mathematicians

https://twitter.com/shallit43/status/2100882164384444798
1•amichail•33m ago•0 comments

Yongsan Electronics Market (Seoul)

https://en.wikipedia.org/wiki/Yongsan_Electronics_Market
3•idatum•34m ago•0 comments

Score Centering Stabilizes Off-Policy Reinforcement Learning

https://arxiv.org/abs/2609.20807
1•zagwdt•34m ago•0 comments

The Other Way AI Impairs Our Thinking

https://www.theatlantic.com/ideas/2026/09/ai-apocalypse-despair-focus/688689/
1•fortran77•38m ago•0 comments

Uber ordered to pay $40M over death of woman left on Southern California freeway

https://ktla.com/news/california/uber-driver-abandoned-rider-freeway/
4•hentrep•38m ago•0 comments

Unit Tests: Protecting Your Code from Being Poorly Handled by Others

https://yosefk.com/blog/unit-tests-mark-territory-more-than-squash-bugs.html
1•birdculture•44m ago•0 comments

Analysis busts myths of Roman road network, offers insight into ancient world

https://www.cnn.com/2026/09/18/science/roman-roads-network-analysis
3•1659447091•46m ago•1 comments

U.S. Has Reached Security Deal on Greenland

https://www.nytimes.com/2026/09/18/us/politics/trump-greenland.html
4•shadowtree•46m ago•1 comments

US gov website used AI search tool from China that FBI said copied Anthropic

https://www.reuters.com/legal/litigation/us-government-website-used-ai-search-tool-china-that-fbi...
4•embedding-shape•47m ago•0 comments

Sony's First Computer

https://hackaday.com/2026/09/18/sonys-first-computer/
2•sohkamyung•48m ago•0 comments