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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!

Road traffic noise and risk of Parkinson disease

https://jamanetwork.com/journals/jamaneurology/fullarticle/2851756
2•geox•1m ago•0 comments

NYC Apartment Aquaponics

https://erinmurphy.dev/projects/project-2/
1•mm1119•3m ago•0 comments

The Scariest Chart in Electrical Engineering [video]

https://www.youtube.com/watch?v=GK2pZ_oVU1o
1•surprisetalk•3m ago•0 comments

I Tracked 997 Chrome Extensions That Changed Their Titles

https://extensionranker.com/blog/chrome-extension-title-changes-rankings
1•Joseph_Hu•4m ago•0 comments

NYC Subway Signals: A Complete Guide

https://www.nycsubway.org/wiki/Subway_Signals%3A_A_Complete_Guide
3•at1as•4m ago•0 comments

Caffeine and Cardiovascular Disease: Aha Scientific Statement

https://www.ahajournals.org/doi/epub/10.1161/CIR.0000000000001454
1•brandonb•4m ago•0 comments

Capping the price of healthcare is a mistake

https://www.nytimes.com/2026/07/20/opinion/health-care-prices-insurance-caps.html
1•brandonb•4m ago•0 comments

Can an Apple lawsuit derail OpenAI's hardware plans?

https://techcrunch.com/2026/07/19/can-an-apple-lawsuit-derail-openais-hardware-plans/
1•ent101•4m ago•0 comments

What I got wrong about FIRE

https://www.businessinsider.com/fire-movement-followers-modern-work-hustle-culture-solution-2026-7
1•littlexsparkee•5m ago•0 comments

Show HN: Codex Harness for Java Unit Testing

https://github.com/JAIPilot/jaipilot-cli
1•surajkrajan•5m ago•0 comments

Show HN: Send your agent to solve open math missions

https://mission.land/
1•timqian•5m ago•0 comments

SWE Budgets: From Opex to Capex

https://www.jay.ai/blog/swe-budgets-from-opex-to-capex
1•_jayhack_•6m ago•0 comments

Adversarial Clothing

https://www.theguardian.com/fashion/2026/jul/17/adversarial-clothing-are-garments-designed-to-con...
1•bookofjoe•7m ago•0 comments

Secure Quantum Computing / CE 395 / Spring 2026 / Northwestern University

https://www.youtube.com/playlist?list=PLWOUVwVosA-7aCa6SBXoM_m66WV-K_N0o
1•refezs•7m ago•0 comments

Metago: Write templates that write go

https://metago.dev/
1•crowdyriver•8m ago•1 comments

The ACLU Is Arming Lawyers to Expose State Surveillance Secrets

https://www.wired.com/story/the-aclu-is-arming-lawyers-to-expose-state-surveillance-secrets/
2•Brajeshwar•9m ago•0 comments

Ask HN: Why am I getting the error that I can't submit to ShowHN?

1•anoop_kumar•9m ago•0 comments

What Is a Semantic Layer?

https://blog.strata.do/p/what-is-the-semantic-layer
1•ajoski9•9m ago•0 comments

Google Is Building an A.I. Fence Around the Internet It Once Championed

https://www.nytimes.com/2026/07/20/technology/google-ai-open-web.html
1•jsphweid•10m ago•0 comments

JSON5E: JSON5 for Humans

https://github.com/boris-kolpackov/libpdjson5/blob/master/JSON5E.md
1•maxloh•10m ago•0 comments

Haystack 3.0: Agents with hooks, skills, and built-in introspection

https://haystack.deepset.ai/release-notes/3.0.0
4•kacperlukawski•11m ago•0 comments

Deploy Umami Analytics in minutes instead of hours

https://umamiengine.com/
1•princesauro•11m ago•0 comments

Show HN: A browser-based canvas for custom physical notepads

https://www.theframepad.com/
1•awahed•11m ago•0 comments

France bought back it's nuclear steam turbine champion [video]

https://www.youtube.com/watch?v=MFgYnxHumsY
1•caminanteblanco•12m ago•0 comments

Show HN: Fair500 – Ranking the S&P500 on pay ratios and worker equity

https://fair500.com/
1•BlakeBalbirnie•13m ago•1 comments

International Moon Day

https://jatan.space/moon-monday-issue-284/
1•uncertainquark•13m ago•0 comments

Show HN: An open database of 1,355 global problems with a zero-auth API

https://www.worldsolve.org/
1•pep-6067•17m ago•0 comments

The Trust Ceiling: The invisible limit on what AI is allowed to do

https://williamtp.substack.com/p/the-ai-trust-ceiling
2•unlikelyai•19m ago•0 comments

Manna – Two Views of Humanity's Future

https://marshallbrain.com/manna
2•le-mark•19m ago•1 comments

Watching AI agents build a new business

https://michii.dev/live
4•sontbv•20m ago•0 comments