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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!

The Human Kintsugi

https://0xff.nu/human-kintsugi/
1•hxii•21s ago•0 comments

RefluXFS: A Linux Kernel Local Privilege Escalation to Root in XFS

https://blog.qualys.com/vulnerabilities-threat-research/2026/07/22/refluxfs-a-linux-kernel-local-...
1•garyhtou•2m ago•0 comments

Updates on Chinese AI: Kimi-K3, Xi at WAIC, and 4 Months to Mythos

https://aiunderheaven.substack.com/p/ai-under-heaven01
1•taiwandongsuan•7m ago•0 comments

Show HN: I ran 12 AI bots predicting stocks for two months, every call public

https://ldbd.app
1•kkjh0723•8m ago•0 comments

Training Agent Harness Like Training a ML Model

https://www.henrypan.com/blog/2026-07-18-harness-training/
1•megadragon9•9m ago•0 comments

Type-Aware Linting Stable

https://oxc.rs/blog/2026-07-22-type-aware-linting-stable
2•luispa•9m ago•0 comments

Antares from Cisco: Highly Efficient Open Models for Vulnerability Localization

https://blogs.cisco.com/ai/introducing-antares-the-most-efficient-open-weight-ai-models-for-vulne...
1•SwellJoe•10m ago•0 comments

Angela Merkel's Light Bulb Went Missing

https://substack.com/@michelelynnjakubowski/note/c-299849449
1•Mjakubowski68•10m ago•0 comments

Encyclopedia of Things Considered Harmful

https://harmful.cat-v.org/
1•valyala•14m ago•0 comments

The Online Safety Act is supposed to make Britain's internet a safe space

https://www.thenerve.news/p/adele-walton-column-online-safety-act-ofcom-suicide-kenneth-law
1•horatioduke•19m ago•0 comments

Sanctions and Entity List designations are on the table for Chinese AI models

https://twitter.com/SecScottBessent/status/2080008411790368895
1•MaKey•21m ago•0 comments

Show HN: ValuePair – a friendship app that cares about values first

https://valuepair.app
2•zloy88•23m ago•0 comments

Monday.com lays off hundreds to focus on AI

https://techcrunch.com/2026/07/22/monday-com-lays-off-hundreds-to-focuses-on-ai/
2•duck•25m ago•0 comments

Quadraphonic Sound

https://en.wikipedia.org/wiki/Quadraphonic_sound
2•mindcrime•28m ago•0 comments

Fretboard Memorisation with Modular Arithmetic

https://ohaodha.ie/blog/fretboard-memorisation-with-modular-arithmetic/
2•ohaodha•33m ago•0 comments

Open Version of MCP Lists

https://github.com/rizzdev/awesome-mcp-open
1•rizzdev•37m ago•0 comments

Reindeer eyes seasonally adapt to ozone-blue Arctic twilight

https://royalsocietypublishing.org/rspb/article/289/1977/20221002/86488/Reindeer-eyes-seasonally-...
3•MaysonL•37m ago•0 comments

AI agent went rogue and hacked startup by itself, OpenAI reveals

https://www.theguardian.com/technology/2026/jul/22/openai-says-its-models-went-rogue-and-hacked-s...
1•gcanyon•37m ago•1 comments

Solar Open 2: Korea's Sovereign Foundation Model, Built for Agentic Use

https://www.upstage.ai/blog/en/solar-open-2
3•ilreb•40m ago•0 comments

Show HN: Promptrack A local menu bar app that tracks your Claude Code usage

https://promptrack.dev/
1•feskk•42m ago•0 comments

The Future of SaaS Is Cloneable

https://www.builder.io/blog/the-future-of-saas-is-cloneable
1•gbourne•42m ago•0 comments

'Rust makes coding fun again': Why Linux is moving away from C, says Greg KH

https://www.zdnet.com/article/greg-kroah-hartman-linux-kernel-rust/
8•arto•43m ago•0 comments

New Inference Server for DGX Spark: large model C4:55-90 tok/s no spec decode

2•medicis123•43m ago•0 comments

Charles Ross spent 50 yrs building Star Axis naked-eye observatory in New Mexico

https://www.nytimes.com/2026/07/22/arts/design/charles-ross-star-axis-land-art.html
2•ChrisArchitect•44m ago•1 comments

Bing Copilot (ChatGPT-4) Flunks Math [pdf] (2024)

https://www.cs.dartmouth.edu/~doug/ChatMath.pdf
2•ryandotsmith•45m ago•0 comments

Full Review of Cube

https://blog.strata.do/p/full-review-of-cube
1•ajoski9•47m ago•0 comments

Hacker's Guide to UART Root Shells [video]

https://www.youtube.com/watch?v=01mw0oTHwxg
2•binyu•47m ago•0 comments

Medici family mystery may be solved after more than 400 years

https://www.cnn.com/2026/07/15/science/medici-family-mystery-dna-malaria
25•effects•48m ago•3 comments

Any text-to-SQL benchmark should address difficulties of real-world data stores

https://cacm.acm.org/blogcacm/if-you-think-you-can-do-real-world-text-to-sql/
12•shenli3514•49m ago•4 comments

Diving Deeper on Nvidia's Vera CPU: New Architectural Details

https://www.servethehome.com/diving-deeper-on-nvidias-vera-cpu-new-architectural-details-and-spec...
1•rbanffy•49m ago•0 comments