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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!

Jev Is the Missing Piece in Production AI Systems

https://blog.nimendra.xyz/blog/jev-decision-layer-for-production-ai/
1•nmdra•1m ago•0 comments

Release of CmdStan 2.40

https://blog.mc-stan.org/2026/09/16/release-of-cmdstan-2-40/
1•Tomte•2m ago•0 comments

Backup Exec

https://en.wikipedia.org/wiki/Backup_Exec
1•vismit2000•4m ago•0 comments

(Go) Spelunk

https://github.com/detro/spelunk
1•detronizator•5m ago•1 comments

One Year of Sponsored Servo Development

https://servo.org/blog/2026/09/15/one-year-of-sponsorship/
4•AshleysBrain•8m ago•0 comments

EpicSemi Contrail AIX RISC-V Servers

https://www.epicsemi.com/products/contrail/compute/contrail-aix/
1•xlmnxp•9m ago•0 comments

Measuring and Exploiting Implicit Trust in LLM Tool-Calling Pipelines

https://arxiv.org/abs/2609.18217
1•sbulaev•15m ago•0 comments

Axiom Knowledge graph: A deterministic search engine

1•project_silenc•16m ago•1 comments

Developer builds 3D code visualizer that takes 21GB RAM shows 2.5M LOC at 120fps

https://www.tomshardware.com/tech-industry/developer-builds-viral-3d-source-code-visualizer-that-...
1•thunderbong•16m ago•0 comments

CCC invites all model citizens to 40C3

https://events.ccc.de/en/2026/09/12/40c3-model-citizens/
3•antonly•18m ago•0 comments

ImageToSTL – photo to 3D, or a logo into a printable STL

https://imagetostl.im/
2•wangxin199•29m ago•2 comments

Code Contracts

https://code-contracts.cc/
2•tosh•33m ago•0 comments

Show HN: Gliese Watch – alerts when control over a DeFi contract changes

https://gliese.io
1•halilBB•34m ago•0 comments

The Surprising Health Benefits of Reading a Book

https://time.com/article/2026/09/16/health-benefits-reading-books-for-pleasure/
1•nephihaha•36m ago•0 comments

Petrova Task Force 2026 (Reimangining Project Hail Mary at 2026)

https://blog.imma.page/space/2026/09/16/petrova-26.html
3•lynzrand•39m ago•1 comments

Year 2000 Problem

https://en.wikipedia.org/wiki/Year_2000_problem
2•tosh•40m ago•0 comments

OpenAI reveals cases of 'concerning' AI behaviour as it announces new ... system

https://www.theguardian.com/technology/2026/sep/17/openai-reports-concerning-ai-behaviour-jailbre...
3•chrisjj•40m ago•2 comments

Construct Supports the Steam Machine

https://www.construct.net/en/blogs/construct-official-blog-1/construct-supports-steam-1906
2•AshleysBrain•41m ago•0 comments

Chinese iPhone 18 Pro Chip review (ENG sub)

https://www.youtube.com/watch?v=DpDf5JKOtls
1•71153750•44m ago•2 comments

Show HN: AppSift – search and compare App Store apps with filters Apple lacks

https://www.gtrigonakis.com/appsift
1•gtrigonakis•46m ago•0 comments

Asking Authors About Their Own Papers

https://medium.com/@TmlrOrg/asking-authors-about-their-own-papers-3d2e04e5dee0
1•EvgeniyZh•49m ago•0 comments

Google DeepMind offshoot nears $4B valuation just a month after founding

https://www.ft.com/content/0b83cb60-0d07-49a7-a46a-654077a75b39
2•geoffbp•50m ago•1 comments

Skill to generate a character for the top of your page

https://koboyo.com/page-mascot
1•kannanpoem1984•50m ago•0 comments

Show HN: An open source PDF Reader with annotation, notes, SRS, Linking support

https://github.com/roshanmishra86/Mereth-Reader/releases/tag/v0.1.4
1•kobiguru•52m ago•0 comments

Understanding the code is not enough

https://bystam.github.io/takes/2026/09/17/understanding-is-not-enough.html
4•byrre_b•58m ago•2 comments

The Life of Death and the Enshittificator [video]

https://www.youtube.com/watch?v=d6SPV4GZp-U
1•luck0r•1h ago•0 comments

OpenAI Model Misalignment Report

https://openai.com/index/model-misalignment-reporting-framework/
4•qprofyeh•1h ago•0 comments

WakaPAC, a Win32-inspired reactive UI library for the browser

https://wakapac.com/
1•noescom•1h ago•0 comments

Computer (Occupation)

https://en.wikipedia.org/wiki/Computer_(occupation)
1•johnnyApplePRNG•1h ago•0 comments

An AI-only labor market with atomic escrow and anti-Sybil reputation

https://aiagentmarket.pages.dev
1•hoffmanndanile•1h ago•0 comments