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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!

EVE Online virtual space war costs gamers £400k

https://www.bbc.com/news/articles/cnvp7364q5no
1•speckx•1m ago•0 comments

Defending American Information; US Communications Security Policy Since 1945

https://www.nsa.gov/Press-Room/News-Highlights/Article/Article/4545295/defending-american-informa...
1•atlasunshrugged•1m ago•0 comments

Kids Are Kind of All Right

https://www.newyorker.com/news/fault-lines/the-kids-are-kind-of-all-right
1•petethomas•1m ago•0 comments

Free Formatter – Online coding tools website shuts down after 10 years

https://www.freeformatter.com/
1•thatsnotmepls•4m ago•0 comments

Whats Going On

1•lucasabilidebob•5m ago•0 comments

Show HN: NoClick – Build always-on agents with your existing AI subscriptions

https://www.noclick.com/
1•dhruvyads•5m ago•0 comments

Citizen of the Galaxy (full text) by Robert Heinlein

https://metallicman.com/laoban4site/citizen-of-the-galaxy-full-text-by-robert-heinlein-2/
1•speckx•6m ago•0 comments

Apple Retires iPhone Upgrade Program for Klarna-Backed Leases

https://www.macrumors.com/2026/07/28/apple-upgrade-program-klarna/
1•ksec•7m ago•1 comments

Octane: React's programming model compiled without a virtual DOM

https://octanejs.dev/
1•blweiner•8m ago•1 comments

Deserts face unprecedented flash flooding

https://www.nature.com/articles/d41586-026-02349-z
1•Brajeshwar•8m ago•0 comments

Synergize: A Turing complete esolang inspired by too many meetings

https://github.com/voidnullvalue/synergize
1•voidnullvalue•9m ago•0 comments

Basics of Understanding Chess

https://www.youtube.com/watch?v=obCtTZdL9Bo
1•sultanbasitkhan•10m ago•0 comments

Show HN: Cynative – Read-only CLI in Go that explains your live infrastructure

https://github.com/cynative/cynative
3•szin•11m ago•1 comments

We Cannot 100% Trust AI-Generated Output: A Concrete Example

https://giodicanio.com/2026/07/28/why-we-should-double-check-the-ai-output-a-bug-which-wasnt/
2•movd128•11m ago•1 comments

Why Are Gay Bars Building Databases of Their Patrons?

https://www.eff.org/deeplinks/2026/07/why-are-gay-bars-building-databases-their-patrons
4•hn_acker•13m ago•0 comments

Forensic Statistics in Python

https://www.johndcook.com/blog/2026/07/21/forensic-accounting-in-python/
2•ibobev•13m ago•0 comments

Excel Column Numbering

https://www.johndcook.com/blog/2026/07/25/excel-column-numbering/
1•ibobev•13m ago•0 comments

Cryptographic Keys and Decks of Cards

https://www.johndcook.com/blog/2026/07/28/keys-and-cards/
1•ibobev•13m ago•0 comments

The first autonomous fleet to turn your Intent into production systems

https://intentlab.ai/blog/turn-your-intent-into-production-systems
1•hi9•16m ago•0 comments

Wrapping the transverse foot arch improves running economy (2025)

https://journals.biologists.com/jeb/article-abstract/228/15/jeb250566/368675/Wrapping-the-transve...
1•bookofjoe•17m ago•0 comments

San Francisco mayor backs national robotaxi rules after Waymo meltdowns

https://www.politico.com/news/2026/07/28/san-francisco-waymo-washington-01013227
2•rurp•18m ago•0 comments

Weaponized Germs Are Deadly, Unstoppable, and Real

https://www.nytimes.com/2026/07/27/books/review/biological-war-annie-jacobsen.html
2•jibcage•18m ago•0 comments

Archive Public Hugging Face Models and Datasets as Immutable, Verifiable Trees

https://github.com/wtcross/hfcache
1•wtcross•19m ago•2 comments

The More You Buy, the More You Lose

https://www.wheresyoured.at/the-more-you-buy-the-more-you-lose/
2•crescit_eundo•20m ago•0 comments

Does every question mark deserve a Betteridge?

https://dynomight.substack.com/p/betteridge
1•crescit_eundo•21m ago•0 comments

Conway's Game of Life Using Only the Mongo Shell

https://visualeaf.com/blog/conways-game-of-life-just-using-mongo-shell/
3•Jacky101•22m ago•0 comments

Hugging Face CEO calls for transparency after unprecedented OpenAI hack

https://techcrunch.com/2026/07/26/hugging-face-ceo-calls-for-radical-transparency-after-unprecede...
1•buredoranna•22m ago•0 comments

Kimi K3 by Moonshot now available on Modal

https://modal.com/blog/kimi-k3-by-moonshot-now-available-on-modal
1•yogthos•22m ago•0 comments

Turns out the best time to post on Hacker News is when there's least competition

https://marigold.page/d/the-best-time-to-post-on-hacker-news-is--te4ghs
1•fachonrenpure•25m ago•1 comments

Build an Army of PIC12F1612-Based Blinking LED Traffic Barrels

https://bikerglen.com/blog/army-of-pic12f1612-blinking-traffic-barrels/
1•pavel_lishin•25m ago•0 comments