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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•11mo 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!

Discord group guessed the URL to Anthropic's Mythos model before CISA used it

https://www.msn.com/en-us/technology/cybersecurity/discord-group-guessed-the-url-to-anthropic-s-m...
3•Imustaskforhelp•7m ago•3 comments

Alkaline-Activated Coal Gangue-Based Geopolymer Grouting Material

https://www.mdpi.com/1996-1944/19/9/1812
1•PaulHoule•21m ago•0 comments

Open weights are quietly closing up – and that's a problem

https://lobste.rs/s/jvvtif/open_weights_are_quietly_closing_up_s
2•maxloh•22m ago•2 comments

Six New High Severity CVEs for Next.js and 1 for React

https://github.com/vercel/next.js/releases/tag/v16.2.5
1•tkel•22m ago•1 comments

Show HN: Web client analyzing prediction market outcomes

https://o-u.ai
1•noplace1ikegone•23m ago•2 comments

Ask HN: GPTs, vs. Software Estimation

2•alaaalawi•31m ago•1 comments

How I made $350K from an open-source JavaScript library using dual licensing

https://www.paritydeals.com/blog/monetize-open-source-dual-licensing/
9•sachinneravath•33m ago•2 comments

PackRip – Browser-based Pokemon TCG pack opener (1999-2011)

https://www.packrip.co
1•liluzipert•35m ago•0 comments

The Global Effort to Figure Out Where Hantavirus Will Strike Next

https://www.wsj.com/health/hantavirus-contact-tracing-cruise-ship-3a9afe33
2•Anon84•36m ago•0 comments

What's the difference between a good thought experiment and a bad one?

https://philosophy.stackexchange.com/questions/138220/whats-the-difference-between-a-good-thought...
1•azeemba•36m ago•0 comments

Leaker: Why Apple Is Delaying the iPhone 18

https://www.macrumors.com/2026/05/06/this-is-why-apple-is-delaying-the-iphone-18/
1•mgh2•36m ago•0 comments

RSS Feeds Send Me More Traffic Than Google

https://shkspr.mobi/blog/2026/05/rss-feeds-send-me-more-traffic-than-google/
3•SpyCoder77•40m ago•1 comments

From a Harvard dropout to Oceanco visionary: 10 facts about Gabe Newell

https://www.boatinternational.com/features-reviews/who-is-gabe-newell-famous-for-valve-steam-oceanco
1•evo_9•46m ago•0 comments

What do you say when the AI asks "Let me know if you'd like me to proceed."

1•acquire9395•48m ago•1 comments

Was this Virginia office building built with missiles in mind?

https://www.washingtonpost.com/dc-md-va/2022/09/03/skyline-buildings-baileys-crossroads/
2•gnabgib•50m ago•1 comments

They don't look like me

https://niccolorastrelli.com/they-dont-look-like-me
14•cainxinth•51m ago•3 comments

OpenAI-Oracle data center construction proceeds despite Michigan town vote

https://fortune.com/2026/05/06/ai-data-center-michigan-saline-politics-farmland/
2•xyst•53m ago•0 comments

Hunk: Review-first terminal diff viewer for agentic coders

https://github.com/modem-dev/hunk
1•pella•56m ago•0 comments

Hourglass nanographenes unlock strong, robust multi-spin entanglement

https://phys.org/news/2026-05-hourglass-nanographenes-strong-robust-multi.html
1•WaitWaitWha•58m ago•0 comments

Gmail app bug locks some Microsoft 365 and Exchange Online users out on Android

https://piunikaweb.com/2026/05/06/gmail-app-android-microsoft-365-exchange-online-authentication-...
1•sega_sai•1h ago•0 comments

Taiwan cops say student's radio kit brought bullet trains to a standstill

https://www.theregister.com/cyber-crime/2026/05/06/taiwan-student-pwns-rail-comms-halts-high-spee...
4•rmason•1h ago•0 comments

Iran hit more U.S. military targets than has been reported, satellite images

https://www.washingtonpost.com/investigations/2026/05/06/iran-us-bases-satellite-images/
58•SanjayMehta•1h ago•21 comments

QR Code Generator

https://www.thonky.com/qrcode/
1•gurjeet•1h ago•0 comments

The Old Guard: Confronting America's Gerontocratic Crisis

https://harpers.org/archive/2026/05/the-old-guard-samuel-moyn-gerontocracy/
11•Caiero•1h ago•2 comments

Elon Musk's Last-Ditch Effort to Control OpenAI

https://www.wired.com/story/elon-musk-recruit-sam-altman-tesla-ai-lab-trial/
5•nico•1h ago•1 comments

How programmers are feeling about AI

https://thesoftwaresurvey.com/
2•yakkomajuri•1h ago•0 comments

We Need a Neural Network (2006)

https://thedailywtf.com/articles/No%2c_We_Need_a_Neural_Network
2•mjtk•1h ago•0 comments

Aphasia

https://en.wikipedia.org/wiki/Aphasia
3•soupspaces•1h ago•0 comments

We Built the Permanent Record

https://www.nationalreview.com/2026/05/we-built-the-permanent-record/
2•petethomas•1h ago•0 comments

Show HN: Sqlalchemy-Redshift Is Back: Reviving a Critical Python Data Library

https://github.com/sqlalchemy-redshift/sqlalchemy-redshift
2•TeddyCrep•1h ago•0 comments