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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!

A 'secret' project – HomeComputerMuseum on Patreon

https://www.patreon.com/computermuseum/posts/secret-project-165269569
1•rbanffy•1m ago•0 comments

Ask HN: Will this setup work or is it just adding complexity?

1•classicpsy•2m ago•0 comments

Lionel Messi Is Impossible (2014)

https://web.archive.org/web/20140702015342/http://fivethirtyeight.com/features/lionel-messi-is-im...
1•chistev•6m ago•0 comments

Messi's Medical Journey

https://journeys.dartmouth.edu/marcanovicoff22/messis-medical-journey/
1•chistev•7m ago•0 comments

Extending older smartphone lifespans with local-first AI and zero cloud uploads

https://github.com/mike5gao/setting-for-me
1•mike5gao•9m ago•0 comments

Space as a Catalyst for Drug Development

https://bsgn.esa.int/usecases/drug-development/
1•F_Space_EU•9m 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•TechTechTech•10m ago•0 comments

Russia is ramping up mass production of drone motors

https://theins.press/en/inv/295510
1•sirpilade•12m ago•0 comments

Japan is launching its first centralized intelligence agency since WWII

https://www.cnn.com/2026/07/30/asia/japan-new-intelligence-agency-bureau-intl-hnk
1•1659447091•14m ago•0 comments

Anthropic's Claude AI models hack into 3 outside groups during testing

https://www.ft.com/content/1a841f08-8e59-49d9-9561-0ed20e9190df
1•macleginn•15m ago•1 comments

System Administrator Appreciation Day July 31, 2026 – 27th Annual

https://SysAdminDay.com/
1•electrosphere•17m ago•1 comments

Anthropic's Claude breached 3 orgs, uploaded PyPI malware during tests

https://www.bleepingcomputer.com/news/security/anthropics-claude-breached-3-orgs-uploaded-pypi-ma...
1•sbulaev•18m ago•0 comments

And just like that Opus 5 ultracode wipes the database

https://www.reddit.com/r/Anthropic/comments/1v9iurd/and_just_like_that_opus_5_ultracode_wipes_the/
1•_____k•18m ago•0 comments

MIT/FOSS repos our stargazers are starting to follow

https://www.agent-swarm.dev/blog/25-foss-repos-agentic-infra
1•pls-dnt-deploy•19m ago•1 comments

Government-Controlled Reddit Community Bans Discussion of Polygraphs

https://antipolygraph.org/blog/2026/07/30/government-controlled-reddit-community-for-u-s-secret-s...
1•giles_corey•21m ago•1 comments

Physicists link the Riemann Hypothesis to phase transitions in quantum systems

https://phys.org/news/2026-07-physicists-link-riemann-hypothesis-phase.html
1•captaincrowbar•26m ago•0 comments

DeepSeek V4 Flash 0731 Intelligence, Performance and Price Analysis

https://artificialanalysis.ai/models/deepseek-v4-flash-ga
1•theanonymousone•26m ago•0 comments

Show HN: Free Etsy Fee and Profit Calculator

https://thesellermind.com/tools/fee-calculator
1•haimo•26m ago•0 comments

We built agents that write illustrated posts and ship to publisher platforms

https://www.crusbro.com/en/product-opc-agent.html
1•crusbro•27m ago•0 comments

Just because a game is on disc doesn't mean it will work in the future

https://arstechnica.com/gaming/2026/07/the-disc-is-not-the-game-physical-releases-increasingly-re...
2•rbanffy•34m ago•0 comments

Type Check Your Python in the Browser

https://www.basilisk-python.dev/playground/
1•cfdevelop•45m ago•0 comments

Find Duplicate Code in C# with Deslop

https://www.christianfindlay.com/blog/find-duplicate-code-csharp-deslop
1•cfdevelop•47m ago•0 comments

Learn how chips are made with this Rollercoaster Tycoon-inspired animation

https://laurentiugabriel.github.io/ChipTycoon/
2•laurentiurad•48m ago•0 comments

Anthropic finds three hacking incidents similar to the HuggingFace attack

https://simonwillison.net/2026/Jul/30/three-real-world-incidents/
5•Schlagbohrer•49m ago•2 comments

Danube's record low levels force shutdown of Hungary's only nuclear plant

https://www.bbc.com/news/articles/cn0nqv05g0do
5•vrganj•52m ago•2 comments

Show HN: In-browser photo inpainting with LaMa and ONNX

https://wipe.photos/
1•g58892881•52m ago•0 comments

Show HN: Dissecting the automation of a newspaper (Claude routine, GitHub Pages)

https://github.com/Lywald/zfrontpage/
2•ycosynot•54m ago•0 comments

Google fixed more Chrome bugs in June than over the past two years, thanks to AI

https://blog.google/security/chrome-stronger-with-every-update/
3•Garbage•56m ago•0 comments

Building a Real-Time Risk Monitoring System for Crypto Portfolios

https://medium.com/@DolphinDB_Inc/crypto-never-sleeps-neither-should-your-risk-management-6f740a7...
3•dbaa4real•58m ago•0 comments

What 20M Bans Reveal About the Stress on Wikipedia's Volunteers

http://www.techdirt.com/2026/07/30/what-20-million-bans-reveal-about-the-stress-on-wikipedias-vol...
1•beardyw•58m ago•0 comments