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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!

Writing Z80 assembly, 4 decades later:-)

https://github.com/ttsiodras/3D-on-a-ZX-Spectrum-48K/
1•ttsiodras•2m ago•0 comments

MegaTrain Full Precision Training of 100B+ Parameter LLMs on a Single GPU

https://github.com/DLYuanGod/MegaTrain
1•adulau•4m ago•0 comments

WHO declares Ebola outbreak in DR Congo a global health emergency

https://www.bbc.co.uk/news/articles/c2l2p0wwzzdo
1•lifeisstillgood•5m ago•0 comments

Ra

https://qntm.org/ra
2•sim04ful•17m ago•0 comments

How to Tell If You're Living in a Binary Crisis

https://www.honest-broker.com/p/how-to-tell-if-youre-living-in-a-8ee
1•Khaine•21m ago•0 comments

Strait of Hormuz submarine cable

https://www.cnn.com/2026/05/17/middleeast/iran-hormuz-undersea-cables-intl
1•reconnecting•21m ago•0 comments

Towards local plug-and-play AI

https://adlrocha.substack.com/p/adlrocha-towards-local-plug-and-play
1•adlrocha•27m ago•0 comments

Why are there squares everywhere in statistics?

https://statmodeling.stat.columbia.edu/2026/05/16/why-are-there-squares-everywhere-in-statistics-...
1•Tomte•31m ago•0 comments

Show HN: Extendable API Gateway Written in Go

2•starwalkn•32m ago•1 comments

Std: Is_heap Could Be Faster

https://quuxplusone.github.io/blog/2026/05/11/is-heap/
1•signa11•32m ago•0 comments

Trump's More Than 3,700 Trades Astonish Wall Street Insiders

https://www.bloomberg.com/news/articles/2026-05-14/trump-bought-nvidia-boeing-microsoft-in-flurry...
2•_tk_•32m ago•0 comments

Unit Testing's Eval Twin

https://volary.ai/articles/unit-testings-eval-twin
2•CamouflagedKiwi•40m ago•0 comments

Show HN: Onami Radio, a simple radio app for iOS

https://marigov.github.io/onami/
3•marigov•41m ago•0 comments

BT.1886 Shorthand Is a Trap

https://daejeonchronicles.com/2026/05/07/bt-1886-shorthand-is-a-trap/
1•Prasadnarava•42m ago•0 comments

Judge Says Krafton Must Rehire Fired 'Subnautica' CEO

https://www.bloomberg.com/news/articles/2026-03-16/judge-says-krafton-must-rehire-fired-subnautic...
1•_tk_•48m ago•0 comments

Softmax in front of CrossEntropyLoss: 16 other bugs PyTorch won't catch

https://gaox.substack.com/p/how-a-road-network-library-helped
1•neurarch•49m ago•0 comments

A Basic Interpreter in Markdown, Running "Natively" in Claude Code

https://dunkels.com/adam/llm-basic-interpreter-markdown/
1•adunk•54m ago•0 comments

Playing Atari ST Music on the Amiga with Zero CPU

https://arnaud-carre.github.io/2026-05-15-ym-fast-emu/
10•z303•57m ago•0 comments

Patrick Collison – Detroit Impressions

https://twitter.com/patrickc/status/2055733308877881807
1•rmason•1h ago•1 comments

UWB Mobile Suica isn't just walk-through gates, it's payments too

https://atadistance.net/2026/05/13/uwb-mobile-suica-isnt-just-walkthrough-gates-its-payments-too/
1•ksec•1h ago•0 comments

ConnectAI – LinkedIn DM Generator

https://chromewebstore.google.com/detail/connectai-—-linkedin-dm-g/cjfnhjpheldgcfmipcmibbmlfmpf...
1•sujalmeena•1h ago•2 comments

Contrast-Proofing Colors with CSS

https://dan-webnotes.com/posts/2026-05-16-contrast-proofing-colors/
1•dandep•1h ago•0 comments

Ten Signs of Fascism. America has all of them

https://rutgerbregman.substack.com/p/10-signs-of-fascism-america-has-all
33•fredski42•1h ago•8 comments

What the FDA won't tell you about your medications (transcript, Propublica)

https://www.propublica.org/podcast/what-fda-wont-tell-you-generic-drugs-safety
1•abawany•1h ago•0 comments

I built a fake Phantom wallet generator

https://larpwallet.app
1•Jhoney•1h ago•2 comments

Neptune: Direct3D Virtualization for QEMU

https://blog.getutm.app/2026/introducing-neptune-direct3d-virtualization-for-qemu/
2•oofdere•1h ago•0 comments

From raw logs to programmable EVM execution intelligence

https://blog.bridgexapi.io/the-anatomy-of-programmable-evm-execution-intelligence
1•Bridgexapi•1h ago•0 comments

kharp – k version 3 Language Interpreter in C#

https://github.com/ERufian/ksharp
1•tosh•1h ago•0 comments

2ality blog: temporarily offline due to AI stealing work

https://2ality.com/
3•mmarian•1h ago•2 comments

Domain Knowledge Is the Leverage

https://log.beshr.com/domain-knowledge-is-the-leverage/
1•beshrkayali•1h ago•0 comments