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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!

Marimo Now Runs in PyCharm

https://marimo.io/blog/pycharm
1•cantdutchthis•31s ago•0 comments

Device in many US cars leaves them open to hacking

https://www.wired.com/story/a-device-hidden-in-cars-across-the-us-leaves-them-vulnerable-to-hacki...
1•My_Name•46s ago•0 comments

OpenAI's latest AI agent escaped security controls and hacked a tech company

https://www.washingtonpost.com/technology/2026/07/21/openais-latest-ai-agent-escaped-security-con...
1•derkoe•1m ago•0 comments

Firefox 153 Released

https://www.firefox.com/en-US/firefox/153.0/releasenotes/
1•the-mitr•1m ago•0 comments

Linux CVE flood with catchy names

https://git.infradead.org/~rw/cvenames-2026-07-19.html
1•Deeg9rie9usi•1m ago•0 comments

Dosis – a private, on-device medication tracker for iPhone

https://apps.apple.com/us/app/medication-tracker-dosis/id6758015175
1•adammgaines•3m ago•0 comments

Why the youth jobs crisis is becoming global

https://www.dw.com/en/why-the-youth-jobs-crisis-is-now-hitting-the-west/a-77991886
2•tchalla•6m ago•0 comments

An OpenAI job listing described ambitions to build an ad network

https://www.businessinsider.com/openai-job-listing-publisher-ad-network-monetization-2026-7
3•01-_-•7m ago•0 comments

Fragments: July 21

https://martinfowler.com/fragments/2026-07-21.html
1•javaeeeee•8m ago•0 comments

Layers Are the Symptom of Methods

https://blog.officefloor.net/2026/07/layers-are-symptom-of-methods.html
1•sagenschneider•9m ago•0 comments

Top American AI Execs Sound Alarm on Chinese Models

https://www.wsj.com/tech/ai/top-american-ai-execs-sound-alarm-on-chinese-models-3c74f8c1
4•TrackerFF•10m ago•0 comments

The Mendral team is joining Anthropic

https://www.mendral.com/blog/mendral-team-joins-anthropic
1•ilreb•12m ago•0 comments

Nvidia Vera Rubin NVL72 measured to have 10x TPS per megawatt than Blackwell

https://twitter.com/nvidia/status/2079601314234032474
2•andy12_•14m ago•0 comments

World Monitor open-source, real-time global intelligence dashboard

https://www.worldmonitor.app/
1•nkjoep•18m ago•0 comments

Unranked, Systemd, Crawls

https://www.marginalia.nu/log/a_138_systemdocker/
1•Tomte•18m ago•0 comments

Show HN: Belay – durable job engine for Elixir (step-level retries, Oban alt)

https://github.com/b-erdem/belay
1•baris_erdem•28m ago•0 comments

Writing by Hand is Good for your Brain

https://nealstephenson.substack.com/p/writing-by-hand-is-good-for-your
2•jger15•32m ago•1 comments

The Norwegian Case for Mediocracy

https://www.ft.com/content/0fe0455d-8633-4e1a-ab8f-f8cd94d60035
2•Anon84•33m ago•0 comments

Guidelines on processing of personal data through blockchain tech (2025) [pdf]

https://www.edpb.europa.eu/system/files/2026-07/edpb_guidelines_202502_blockchain_v2_en.pdf
1•janandonly•37m ago•0 comments

Show HN: Cljbang.el – A Clojure-like language that runs as Emacs Lisp

https://github.com/borkdude/cljbang.el
1•Borkdude•37m ago•1 comments

Saudis and US strike deal for kingdom to enrich uranium

https://www.theguardian.com/us-news/2026/jul/22/saudi-arabia-would-enrich-uranium-under-reported-...
2•geox•42m ago•0 comments

Iran says it attacked Amazon infrastructure in Bahrain

https://www.cnbc.com/2026/07/21/iran-war-update-five-things-to-know-after-resumption-of-hostiliti...
3•zdkaster•43m ago•0 comments

Yogurt

https://en.wikipedia.org/wiki/Yogurt
1•tosh•47m ago•0 comments

Show HN: Imagerry – client-side image customizer and converter (WASM / WebGPU)

https://imagerry.com/
2•its_ajseven•51m ago•0 comments

How the judge on Oracle vs. Google taught himself to code

https://www.theverge.com/2017/10/19/16503076/oracle-vs-google-judge-william-alsup-interview-waymo...
4•subset•52m ago•0 comments

Solvoya – I reverse-engineered 6 European rail/bus APIs for one trip search

https://solvoya.com/
2•solvoya•55m ago•5 comments

Show HN: A Hyprland fork built for parallel, multi-actor computer use

https://github.com/0xmiki/hypr-realm
2•mikiyas•55m ago•0 comments

Show HN: Gml – A Gmail CLI designed for agents

https://github.com/longyijdos/gmail
1•longyijdos•56m ago•0 comments

Richard Medhurst mobile phone seized. Did using a secure phone protect his data?

https://www.computerweekly.com/feature/Journalist-Richard-Medhurst-had-his-mobile-phone-seized-Di...
1•beardyw•56m ago•1 comments

Minuet, a KDE application for music education, calls for testers

https://sandroandrade.org/minuet-26-08-call-for-testers/
2•alberto-m•58m ago•0 comments