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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!

1•tudorizer•10s ago

Tool to verify DKIM signatures on an mbox of emails

https://github.com/associatedpress/verify-dkim
1•mooreds•59s ago•0 comments

Defining AI Psychosis. Part 3: "Parasocial AI Psychosis"

https://jeffs.blog/p/defining-ai-psychosis-part-3-parasocial
3•euthymiclabs•3m ago•0 comments

Ok Google: please publish your DKIM secret keys (2020)

https://blog.cryptographyengineering.com/2020/11/16/ok-google-please-publish-your-dkim-secret-keys/
1•mooreds•3m ago•0 comments

I discovered roads in the US across > 1000 themes

https://road-about-a-theme.pinedesk.biz/
1•91awebsi•4m ago•1 comments

Jevmem – automatic project memory for Claude Code, built on Jev

https://github.com/Avinash-jetwani/jevmem
3•avinashjetwani•5m ago•0 comments

VestFin – Privacy-first, manual-entry personal finance app

https://vestfin.app/en/
1•AB_Garcia•5m ago•0 comments

Poo

1•sarieems•5m ago•0 comments

DTAP – check Linux servers infrastructure with Bash

http://dtap.sparrowhub.io:9192/doc/checks
1•melezhik•7m ago•1 comments

How to Build an Electrostate

https://www.bloomberg.com/news/articles/2026-09-24/how-to-build-an-electrostate
1•toomuchtodo•8m ago•1 comments

The end times fascists are plotting their escape from our world

https://www.theguardian.com/us-news/ng-interactive/2026/sep/13/end-times-fascists-essay
2•xyzal•9m ago•0 comments

Over 2.8M Audi and Volkswagen vehicles face recall worldwide

https://www.euronews.com/2026/09/25/over-28-million-audi-and-volkswagen-vehicles-face-recall-worl...
1•Markoff•10m ago•1 comments

DNS: A Replacement for Finger

https://nochan.net/b/Internet-Crap/20260527-DNS-A-Replacement-For-Finger/
1•Bender•12m ago•0 comments

N-Th Numbers

https://dpdmancul.gitlab.io/blog/2026/09/n-th-numbers/
3•DPDmancul•12m ago•0 comments

Strauss–Howe Generational Theory

https://en.wikipedia.org/wiki/Strauss%E2%80%93Howe_generational_theory
1•jerlendds•12m ago•0 comments

New Apple TV 4K Leaked

https://www.macrumors.com/2026/09/25/new-apple-tv-4k-leaked/
2•mikhael•13m ago•0 comments

Claude Code Integration with iTerm2 Is Legitimately Awesome

https://www.reddit.com/r/ClaudeCode/s/Gsi3XsHEJg
3•KazaNLP•14m ago•0 comments

The Supreme Court revives a controversial data system for citizenship checks

https://www.npr.org/2026/09/25/nx-s1-5976804/supreme-court-trump-save-noncitizen-voting
2•mikhael•15m ago•0 comments

Biolinq's color-coded glucose sensor patch nets FDA clearance

https://www.fiercebiotech.com/medtech/biolinqs-color-coded-glucose-sensor-patch-nets-fda-clearance
1•brandonb•16m ago•0 comments

Show HN: Choreoglyphs – our new, invisible writing system

https://choreoglyphs.com/
2•spython•18m ago•0 comments

Trump admin using AI to deny medical care for seniors in disastrous experiment

https://arstechnica.com/health/2026/09/trump-admin-using-ai-to-deny-medical-care-for-seniors-in-d...
4•clumsysmurf•23m ago•0 comments

Self-Complexity

https://en.wikipedia.org/wiki/Self-complexity
1•toomuchtodo•23m ago•0 comments

YOLO Linux

https://yololinux.com/
1•raattgift•24m ago•1 comments

Show HN: Draw something once a day with friends

https://justdraw.peerdiem.com/
1•afkqs•25m ago•0 comments

Missile Task

https://beza1e1.tuxen.de/lore/missile_task.html
1•gavinhoward•26m ago•0 comments

In Company Style: Illustrations from James Skinner's Kitāb-I tashrīḥ al-aqvām

https://publicdomainreview.org/collection/james-skinner-india-castes/
1•SamuraiLion•26m ago•0 comments

Measuring Taiwan's Mobile Slowdown with OONI in Taipei

https://mashbean.net/en/blog/2026/0813-16xy2v/
1•DemiGuru•27m ago•0 comments

SlopCop Power Ranking: live tickets in a 1.1M loc codebase

https://slopcop.com/power-ranking
1•jbellis•27m ago•0 comments

Meta bans another Toronto performer from Instagram and Facebook over Bikini

https://www.thestar.com/news/gta/meta-bans-another-toronto-performer-from-instagram-and-facebook-...
2•bhouston•28m ago•0 comments

Small questions, measurable gains with Jev – CraftCX

https://craftcx.com/blog/moving-support-decisions-to-jev
1•dugjason•29m ago•0 comments