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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!

A Theory of Arrays (ToA) Union Find

https://www.philipzucker.com/toa_unionfind/
1•g0xA52A2A•8m ago•0 comments

Web-based cryptography is always snake oil

https://www.devever.net/~hl/webcrypto
1•enz•9m ago•0 comments

Knowledge Should Not Be Gated

https://www.formaly.io/blog/knowledge-should-not-be-gated
1•nezhar•11m ago•0 comments

India seeks to quell public backlash on ethanol-mixed fuel

https://www.reuters.com/world/india/india-seeks-quell-public-backlash-ethanol-mixed-fuel-after-ex...
1•JumpCrisscross•17m ago•0 comments

SigMap: 97% token reduction for AI coding sessions

https://sigmap.io/
3•handfuloflight•18m ago•0 comments

Notaru

https://notaru.org/
1•handfuloflight•21m ago•0 comments

Show HN: I trained a language model that thinks the capital of Japan is Paris

https://hamiltonianresearch.xyz/blog/hr-diffuse-1.html
3•farisallafi•23m ago•0 comments

code-on-incus: Give each AI agent its own isolated machine with root

https://github.com/mensfeld/code-on-incus
1•Tomte•28m ago•0 comments

Programmers need to start meditating now

https://jacob.gold/posts/programmers-need-to-start-meditating-now/
2•enz•31m ago•0 comments

NirCmd – Windows command line tool

https://www.nirsoft.net/~nirsoft/utils/nircmd.html
1•thunderbong•38m ago•0 comments

Paul Pelosi in hit-and-run in Napa County wine country, police say

https://www.sfgate.com/news/politics/article/paul-pelosi-in-hit-and-run-in-napa-county-wine-22332...
1•turtlegrids•39m ago•0 comments

BESS deployment to escalate as lenders see the light

https://tamarindo.global/insight/analysis/bess-deployment-to-escalate-as-lenders-see-the-light/
1•zeristor•40m ago•0 comments

Fast Software, the Best Software

https://craigmod.com/essays/fast_software/
1•ustad•45m ago•0 comments

Electronic Engineers Master Catalog

https://archive.org/details/electronicengine00unse_8
1•ustad•46m ago•0 comments

Reducing Assumptions, Exploding Your Code

https://ryelang.org/blog/posts/reducing_assumptions_but_exploding/
2•mpweiher•48m ago•0 comments

Dark Mode with Web Standards

https://olliewilliams.xyz/blog/dark-mode/
2•thm•53m ago•0 comments

Splitzen – Split group expenses with one link, no sign-up

https://getsplitzen.vercel.app
1•piprads•53m ago•0 comments

Authors Sue Anthropic for $75M

https://theguptalog.blogspot.com/2026/07/100-authors-sue-anthropic-for-75m.html
1•guptalog•54m ago•0 comments

Show HN: WakaWiki, a CLI that maintains agent documentation for your codebase

https://github.com/sonyarianto/wakawiki
1•sonyarianto•54m ago•0 comments

Meta's Brain2Qwerty v2: A non-invasive brain-computer interface

https://facebookresearch.github.io/brain2qwerty/
2•mgh2•55m ago•0 comments

Codex Threads

https://github.com/kcosr/codex-threads
1•handfuloflight•1h ago•0 comments

New Android security setting spots bad networks and fake cell towers

https://www.zdnet.com/article/android-security-setting-spots-bad-networks-and-fake-cell-towers-ho...
2•tlhunter•1h ago•0 comments

Will co-located solar and BESS be the main driver of Europe's energy transition?

https://tamarindo.global/insight/analysis/will-co-located-solar-bess-be-the-main-driver-of-europe...
1•zeristor•1h ago•0 comments

Hunch – a Git-native decision graph your AI assistant obeys

https://hunch-pi.vercel.app
1•huchdave•1h ago•0 comments

Mysterious debris could be 'space balls'– may contain toxic rocket fuel

https://www.theguardian.com/australia-news/2026/jul/05/mysterious-debris-found-on-queensland-beac...
6•defrost•1h ago•0 comments

Nuclear Startups Hit a Big Milestone. Why It Matters–and Why It Doesn't

https://www.wired.com/story/nuclear-startups-hit-milestone-why-it-matters/
4•joozio•1h ago•0 comments

Agentsnap – find which config change broke your AI agent

https://drive.google.com/file/d/1oPTmOOkBtE0IRV4oy0K4NuuLxYBezXRc/view?usp=sharing
1•Gladi•1h ago•0 comments

Light Painting Tutorial, How to Light Paint a Light Man(2016)

https://lightpaintingphotography.com/light-painting-photography/light-painting-tutorial-how-to-li...
1•hopelessluca•1h ago•0 comments

GetSuperpower, an installable skill tree for coding agents

https://github.com/0xroylee/getsuperpower
2•1997roylee•1h ago•0 comments

'It's whack-a-mole': how Europe's smart border melted down

https://www.ft.com/content/3ed70f64-7443-4241-ac0f-38eabe218913
4•thm•1h ago•1 comments