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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!

Causeval – statistically rigorous, causal evaluation for LLM apps

https://github.com/routsom/causeval
1•somrout•33s ago•0 comments

How to copy login keychains that can be unlocked

https://eclecticlight.co/2026/10/02/how-to-copy-login-keychains-that-can-be-unlocked/
1•frizlab•1m ago•0 comments

Nabby – minimal self-hostable yt-dlp web UI

https://nabby.pro/
1•njpteam•8m ago•0 comments

NSA: Post-Quantum Cryptography Resource Hub

https://www.nsa.gov/Cybersecurity/Post-Quantum-Cryptography-Resource-Hub/
1•donutloop•12m ago•0 comments

Senate Hearings to examine rogue AI

https://www.congress.gov/event/119th-congress/senate-event/338785
1•reasonableklout•12m ago•1 comments

PipeWire Setup and Fundamentals

https://www.benashby.com/resources/pipewire-setup-fundamentals/
2•ankitg12•14m ago•0 comments

Alexandria Eschate

https://en.wikipedia.org/wiki/Alexandria_Eschate
1•stein1946•14m ago•0 comments

"We're not going to shoot ourselves in the foot" over hack fallout, says OpenAI

https://www.technologyreview.com/2026/09/30/1145339/were-not-going-to-shoot-ourselves-in-the-foot...
1•joozio•15m ago•0 comments

Quantitative Finance with OCaml

https://qcaml.com/index.html
1•leonry•18m ago•0 comments

Land or Water?

https://twitter.com/karpathy/status/2105909609487872075
1•tosh•26m ago•0 comments

$250M Apple AI Settlement – iPhone 15/16 Users Can Claim $25 to $95 per Device

https://openclassactions.com/settlements/false-advertising/apple-intelligence-siri-false-advertis...
4•openclassaction•27m ago•1 comments

Show HN: Realtime eBay Filtering with Jev

https://tv.junkdrawer.ai
2•junkDrawer_ai•28m ago•0 comments

Show HN: Apple Developer MCP, App Store Connect via Your AI Assistants

https://nova.civai.co/agent/mcp-apple_developer
1•usecodenaija•29m ago•0 comments

PewDiePie's Ajax

https://data.pewdiepie.com/
2•dvrp•29m ago•0 comments

Claude Usage Monitor for Windows

https://github.com/mheilemann/ClaudeUsageMonitor/
1•mheilemann•30m ago•1 comments

US death row inmate survives execution attempt after two lethal injections

https://www.bbc.com/news/articles/cq8r6rjdvlx6o
1•vrganj•32m ago•0 comments

Booms, Bombs and Bonds: Interest Rates, Part I

https://paulkrugman.substack.com/p/booms-bombs-and-bonds-interest-rates
1•runeks•35m ago•0 comments

Microsoft's Big Copilot Rethink

https://www.theverge.com/tech/1003365/microsoft-copilot-os-for-work-notepad
1•saikatsg•37m ago•0 comments

The AI data center e-waste problem is huge

https://www.theverge.com/ai-artificial-intelligence/996470/ai-data-center-e-waste-ban
1•saikatsg•38m ago•0 comments

We Do Know How, but Not the How We Want

https://cacm.acm.org/blogcacm/we-do-know-how-but-not-the-how-we-want/
1•adunk•38m ago•0 comments

Thunderbird for iOS: A First Look

https://blog.thunderbird.net/2026/10/thunderbird-for-ios-a-first-look-at-the-native-iphone-email-...
4•HieronymusBosch•39m ago•0 comments

China's rise as a health tech superpower is important

https://restofworld.org/2026/china-ai-healthcare-biotech-drugs/
3•stareatgoats•48m ago•0 comments

Software doesn't need to be readable anymore. it needs to be explainable

https://ghuntley.com/readable/
1•ghuntley•51m ago•1 comments

Gnomish relay: a secure remote control for coding agents in World of Warcraft

https://www.curseforge.com/wow/addons/gnomish-relay
1•eserilev•56m ago•0 comments

Dagenza – a fresh new calendar app for iPhone

https://testflight.apple.com/join/sKcmUdAq
1•marc0janssen•59m ago•1 comments

Glashütte Trash Clock – A 30-minute pendulum clock made from trash

https://niklasroy.com/gtc/
1•r0r0•1h ago•1 comments

AI godfather Yann LeCun: Anthropic CEO deluded, doesn't understand cybersecurity

https://fortune.com/2026/10/01/yann-lecun-anthropic-ceo-dario-amodei-deluded-crazy-cybersecurity/
10•OtomotO•1h ago•0 comments

Is Claude Conscious?

https://www.nytimes.com/2026/09/29/us/anthropic-claude-morals-ai.html
1•langitbiru•1h ago•2 comments

It's the Kernel's Fault: Custom Page Fault Handling with Bpf_fault

https://dl.acm.org/doi/10.1145/3830418.3843896
1•theanonymousone•1h ago•0 comments

Explore decision models in one place with Decisions API

https://decisions-api.dev
3•QingWu•1h ago•1 comments