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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!

Gatwick Airport left without running water at both terminals

https://www.bbc.com/news/articles/cdew2dnxlzzo
1•bookofjoe•3m ago•0 comments

This July I Was Fired from Simple AI (A Deeply YC Company)

https://andys.blog/this-july-i-was-fired-from-simple-ai/
1•andytratt•3m ago•0 comments

Welcome to the age of decadence without pleasure

https://www.theguardian.com/us-news/ng-interactive/2026/jul/26/age-of-decadence-pleasure-ai
1•n1b0m•4m ago•0 comments

Ask HN:Anyone know a good AI slop detection service.

2•boveyking•9m ago•0 comments

Climate change is now threatening a pillar of childhood: summer break

https://www.npr.org/2026/07/26/nx-s1-5900911/wildfire-smoke-fires-camp-minnesota
3•geox•11m ago•0 comments

Van freed after two years trapped in automated car park (2025)

https://www.bbc.com/news/articles/c20z46p0p6jo
1•starkparker•12m ago•0 comments

Malicious sites use JavaScript to build malware in browser memory

https://www.bleepingcomputer.com/news/security/malicious-sites-use-javascript-to-build-malware-in...
2•Brajeshwar•12m ago•0 comments

Roast My Startup (thebuildnation.com)

1•Guru_Raj•13m ago•0 comments

Agent Harness Design for Claude

https://claude.com/blog/harnessing-claudes-intelligence
1•ankitg12•13m ago•0 comments

Are we all programmers now? We Replaced the Build Layer, Not the Runtime

https://ibrahimcesar.cloud/blog/we-replaced-the-build-layer-not-the-runtime/
1•ibrahimcesar•15m ago•0 comments

Show HN: Cookbook AI – turn scattered recipe files into a print-ready cookbook

https://cookbookai.io/index.html
2•bookletaitcv1re•20m ago•0 comments

Make an Origami Circuit Board

https://spectrum.ieee.org/origami-circuit-boards
4•ohjeez•22m ago•0 comments

Terminal-native music and video player

https://github.com/dangerous-person/dopogoto-terminal-player
2•jimsojim•23m ago•0 comments

Show HN: CheapSecurity – Lightweight, Self-Hosted CCTV for Linux SBCs

https://github.com/gmrandazzo/CheapSecurity
5•zeldone•24m ago•0 comments

Show HN: A client side PDF and article reader backed by Google Drive

https://pdf-reader-peach.vercel.app/
2•northfield27•25m ago•0 comments

Ask HN: Is an in-page speed reader useful?

2•jvbotelho•25m ago•2 comments

We Are Not Special (2021)

https://www.hillelwayne.com/post/we-are-not-special/
3•birdculture•25m ago•0 comments

Design Is Compromise

https://stephango.com/design-is-compromise
10•ankitg12•27m ago•0 comments

Who's afraid of open source AI?

https://www.youtube.com/watch?v=siy0744Ykys
2•frag•28m ago•0 comments

Tools and Rituals for Reflecting

https://ask.metafilter.com/254216/What-are-your-tools-and-rituals-for-reflecting-on-the-past-year
2•ankitg12•30m ago•0 comments

DROS-VEP – A <1μs C-ABI binary circuit breaker for AI agents

https://github.com/Top-Celestial-Company-Ltd/DROS-VEP-lite
3•dros_jimmy•32m ago•0 comments

Car Plows into Crowd at Berlin Pride Event in Suspected Terror Attack

https://www.nytimes.com/2026/07/25/world/europe/berlin-car-attack.html
3•whack•33m ago•3 comments

What Sam Altman will tell the White House this week

https://www.axios.com/2026/07/26/sam-altman-openai-trump-white-house-visit?mrfcid=202607266a5afa4...
3•flurly•38m ago•0 comments

Iran calls Ukraine's strikes on Iranian vessels 'hostile and criminal'

https://www.cnbc.com/2026/07/26/ukraine-strikes-iranian-vessels-tehran-accuses-kyiv-of-hostile-ac...
3•MilnerRoute•39m ago•0 comments

Why Los Angeles Stopped Repaving Its Streets

https://www.city-journal.org/article/los-angeles-streets-repaving-disability-rules
3•toomanyrichies•39m ago•0 comments

108 PRs in eight days: Accidentally discovering loop engineering

https://brittany-ellich.offprint.app/a/3mrjj34puva23-108-prs-in-eight-days-accidentally-discoveri...
1•overcommitted•39m ago•0 comments

Canada must prepare for bigger wildfires, every summer – forever

https://www.thestar.com/news/canada/our-smoke-filled-future-how-canada-must-prepare-for-bigger-wi...
3•Teever•43m ago•2 comments

AI agents are eating the Web, growing by 8,000% and rewiring business models

https://fortune.com/2026/07/23/dead-internet-theory-bots-agents-majority-web-traffic/
3•CharlesW•47m ago•0 comments

A Love Letter to Object Orientation

https://blog.mempko.com/a-love-letter-to-object-orientation/
1•mempko•49m ago•1 comments

The Question Is the Hard Part

https://seriousmountain.substack.com/p/the-question-is-the-hard-part
1•mc-serious•49m ago•0 comments