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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!

Show HN: Make Video from Photo for Free

https://makevideofromphoto.com/
1•pekingzcc•2m ago•0 comments

Beijing humanoid robot half-marathon

https://www.youtube.com/watch?v=NwBK8EH5KlY
1•Animats•18m ago•0 comments

The Flipper Zero is now rewriting electronic price tags (The Verge)

https://www.theverge.com/tech/912713/the-flipper-zero-is-now-rickrolling-electronic-price-tags-at...
1•hackerfizh•21m ago•0 comments

We ran 1,000 queries through ChatGPT: 48 domains produced 22.5% of citations

https://growtika.com/blog/chatgpt-citation-economy
1•Growtika•24m ago•0 comments

Book Summary: "Essentialism" by Greg McKeown

https://nielsbohrmann.com/essentialism-book-summary/
1•dsego•25m ago•0 comments

GitHub – Merit-Systems/Echo: The User Pays AI SDK

https://github.com/Merit-Systems/echo
2•fagnerbrack•35m ago•0 comments

Show HN: Fuelgauge – a Claude Code status line that doesn't need Node

https://github.com/adityaarakeri/fuelgauge
2•humblejedi•38m ago•0 comments

Third Place

https://en.wikipedia.org/wiki/Third_place
1•thunderbong•39m ago•0 comments

Meta to cut 8k jobs 10% of workforce in major bloodbath next month

https://nypost.com/2026/04/17/business/meta-to-cut-8000-jobs-in-major-bloodbath-next-month-report/
4•1vuio0pswjnm7•45m ago•1 comments

Prefill-as-a-Service:KVCache of Next-Generation Models Could Go Cross-Datacenter

https://arxiv.org/abs/2604.15039
2•matt_d•47m ago•0 comments

Ultrafast spectral primes generator (Python code)

https://github.com/model-vpr/ultrafast-spectral-primes
2•vpr-research•56m ago•0 comments

Generative artificial intelligence for computational chemistry

https://arxiv.org/abs/2409.03118
1•bdg•1h ago•0 comments

Design.md

https://github.com/VoltAgent/awesome-design-md
1•granto•1h ago•0 comments

Chernobyl's last wedding: The couple who married as a nuclear disaster unfolded

https://www.bbc.com/news/articles/c0q92lx8q75o
1•1659447091•1h ago•0 comments

Cheng Li-Wun: From Hunger Strike for Taiwan Independence to Meeting Xi Jinping

https://taiwan.md/en/people/cheng-li-wun/
1•salkahfi•1h ago•0 comments

Breakthrough Prize Announces 2026 Laureates

https://breakthroughprize.org/News/98
1•diwank•1h ago•0 comments

Show HN: AgentKey – Access governance for AI agents

https://agentkey.dev
2•cracadumi•1h ago•3 comments

Study suggests some Alzheimer's symptoms may begin outside the brain

https://medicalxpress.com/news/2026-04-alzheimer-symptoms-brain.html
2•bookmtn•1h ago•0 comments

2026 humanoid robot half-marathon kicks off in Beijing [video]

https://www.youtube.com/watch?v=zqgc9C3cC6U
1•kasperni•1h ago•0 comments

Master of chaos wins $3M math prize for 'blowing up' equations

https://www.scientificamerican.com/article/master-of-chaos-wins-usd3m-math-prize-for-blowing-up-e...
1•tzury•1h ago•0 comments

The next food crisis may have begun

https://www.irishtimes.com/world/middle-east/2026/04/16/the-worlds-next-food-crisis-may-have-alre...
3•measurablefunc•1h ago•0 comments

Shanghai Relocates Neighbourhood with Robots (2025)

https://parametric-architecture.com/shanghai-relocates-7500-ton-shikumen-complex-with-robots/
1•thenthenthen•1h ago•0 comments

Berkeley EECS undergraduate TAs paid $89-102/HR

https://twitter.com/minilek/status/2045632119087448164
2•osnium123•1h ago•1 comments

Show HN: Fuelgauge – a Claude Code status line that doesn't need Node

https://github.com/adityaarakeri/fuelguage
1•humblejedi•1h ago•1 comments

Ask HN: Which IDE are you using?

1•wasimsk•1h ago•3 comments

Trump orders fast tracking review of psychedelics for mental health disorders

https://www.npr.org/2026/04/18/nx-s1-5789859/psychedelic-treatments-mental-health
6•mikhael•1h ago•1 comments

Show HN: Customer Reviews can be represented through Voice capture/generation

https://customersvoices.com
1•Zavora•2h ago•0 comments

Garbage Collection Without Unsafe Code

https://fitzgen.com/2024/02/06/safe-gc.html
2•foota•2h ago•0 comments

First trailer released for western starring AI version of Val Kilmer

https://www.theguardian.com/film/2026/apr/16/first-trailer-released-for-ai-val-kilmer-western
1•breve•2h ago•1 comments

Ask HN: Where do I submit a bug report for Windows Snipping Tool?

1•pests•2h ago•0 comments