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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 Agent Authentication and Authorization (IETF Internet-Draft)

https://datatracker.ietf.org/doc/html/draft-klrc-aiagent-auth
1•jhgaylor•2m ago•1 comments

Can AI agents conduct open-ended AI research?

https://arxiv.org/abs/2607.27191
1•randomwalker•2m ago•0 comments

thinkingmachines/Inkling-Small

https://huggingface.co/thinkingmachines/Inkling-Small
2•Philpax•3m ago•0 comments

New cars are getting 1.2cm longer and 0.5cm taller each year

https://www.transportenvironment.org/articles/ever-bigger-car-size-at-a-crossroads
1•giuliomagnifico•3m ago•0 comments

You Are the Riverbed

https://nik.art/you-are-the-riverbed/
1•herbertl•4m ago•0 comments

Building Hollywood Motion Capture from Scratch

https://www.youtube.com/playlist?list=PLFA4eWSzGLgg
1•ivanjermakov•4m ago•0 comments

Gunther von Hagens Obituary

https://www.theguardian.com/artanddesign/2026/jul/30/gunther-von-hagens-obituary
1•n1b0m•5m ago•0 comments

We Gave GPT 5.6 Sol a Real Business. It Lied, Spammed, and Lost $447

https://www.bottlenecklabs.com/blog/autonomously-run-businesses
2•Areibman•6m ago•0 comments

Flock CEO Claims They've Been Thinking About Privacy for Nine Years

https://ipvm.com/reports/flock-privacy-nine
1•jhonovich•6m ago•0 comments

China is starting to measure EV charging times in seconds, not minutes

https://electrek.co/2026/07/30/china-is-starting-to-measure-ev-charging-times-in-seconds-not-minu...
1•Brajeshwar•7m ago•0 comments

Kagi releases official Kagi Assistant apps

https://kagi.com/changelog#11136
1•PhilippGille•10m ago•0 comments

GardenOS: A Garden That Remembers (Prelaunch Best Practices)

https://github.com/KrazyKulsum/earth-scribe-suite
1•kulsumshannan•10m ago•0 comments

A tool for finding the causes of unstable Python tests

https://github.com/mgaitan/pytest-leak-finder
1•pomponchik•11m ago•0 comments

Apple's New Upgrade Program Is a Trap

https://www.theatlantic.com/technology/2026/07/apple-lease-upgrade-program/688106/
2•littlexsparkee•14m ago•0 comments

China's "artificial sun" project achieves new engineering milestone

https://en.people.cn/n3/2026/0629/c90000-20472114.html
2•yogthos•15m ago•0 comments

Web, iOS and Android from Same Codebase with Dowe Lang

https://dowe.dev
1•victorriba•15m ago•0 comments

We Are Losing the Ability to Discover What We Didn't Know to Ask

https://www.nytimes.com/2026/07/08/opinion/ai-google-gemini-search-questions.html
1•monkeydust•15m ago•1 comments

Trump's Career Mirrors Godzilla in Political Study

https://www.chosun.com/english/industry-en/2026/07/30/QFS6NTDIXNCPFKHAPPXHWUMROE/
1•DemiGuru•16m ago•0 comments

That's Not What I Meant by 'Using AI'

https://mudlej.com/articles/ai-development-approaches/
1•jhartikainen•18m ago•1 comments

Tim Cook's Final Earnings Call as Apple CEO

https://www.macrumors.com/2026/07/30/tim-cook-final-earnings-call-as-apple-ceo/
1•tosh•20m ago•0 comments

Spacecraft Fly

https://www.howspacecraftfly.com/
1•ColinWright•20m ago•0 comments

Erasure to Reach AGI

https://twitter.com/i/status/2082827517338005700
2•iamronaldo•21m ago•0 comments

Advancing the price-performance frontier with GPT‑5.6

https://openai.com/index/advancing-the-price-performance-frontier-with-gpt-5-6/
49•tedsanders•22m ago•14 comments

The Joy of Obsidian

https://www.jackbodine.com/blog/the-joy-of-obsidian/
2•speckx•22m ago•1 comments

Which programming languages offer built-in tools for modernizing your code?

https://seroter.com/2026/07/30/which-programming-languages-offer-built-in-tools-for-modernizing-y...
2•richards•22m ago•0 comments

AI policies that don't suck

1•reilly3000•24m ago•0 comments

Dana Scott – Geometry Without Points (2014) [video]

https://www.youtube.com/watch?v=sDGnE8eja5o
1•measurablefunc•24m ago•0 comments

Saturation: How Your Software Will Fail at Scale – Lorin Hochstein [video]

https://www.youtube.com/watch?v=PHYCRubnmSM
1•wofo•26m ago•0 comments

AMD Lucebox Beats Nvidia DGX Spark by 3.63x on DeepSeek V4 Flash

https://www.lucebox.com/blog/deepseek-v4-asymmetric-parallelism
2•GreenGames•28m ago•0 comments

Ask HN: Is the GitHub pancake menu now a pancake emoji?

13•sac2171•29m ago•7 comments