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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!

Role of Reconstruction in the Inertness of Gold Toward Oxygen

https://journals.aps.org/prl/abstract/10.1103/g3bc-t1qv
1•bookofjoe•3m ago•0 comments

SF Bay Area Webcams

https://sfcam.live/
1•striking•7m ago•0 comments

Applying metaphors from other fields into software development

https://codeutopia.net/blog/2026/05/23/applying-metaphors-from-other-fields-into-software-develop...
1•nreece•9m ago•0 comments

SSV: Sparse Speculative Verification for Efficient LLM Inference

https://arxiv.org/abs/2605.19893
1•matt_d•13m ago•0 comments

Characterizing Real-World Bugs in Tile Programs for Automated Bug Detection

https://arxiv.org/abs/2605.19652
1•matt_d•15m ago•0 comments

The day my ping took countermeasures

https://blog.cloudflare.com/the-day-my-ping-took-countermeasures/
3•moonleay•16m ago•0 comments

Trump Post Shows Him Gazing at Greenland After Local 'No Means No' Protests

https://www.newsweek.com/trump-post-shows-him-gazing-at-greenland-after-local-no-means-no-protest...
2•SilverElfin•18m ago•0 comments

Characterization of machine learning compilers for LLM inference on NVIDIA GPUs

https://link.springer.com/article/10.1007/s11227-026-08559-6
1•matt_d•18m ago•0 comments

Shannon Got AI This Far. Kolmogorov Shows Where It Stops

https://medium.com/@vishalmisra/shannon-got-ai-this-far-kolmogorov-shows-where-it-stops-c81825f89ca0
1•dnw•19m ago•0 comments

Images are not displayed in emails, newsletters or signatures in classic Outlook

https://support.microsoft.com/en-us/office/images-are-not-displayed-in-emails-newsletters-or-sign...
1•tech234a•23m ago•1 comments

Propuesta TLBIC: Cuarta versión en español

2•michikawa59•25m ago•0 comments

Scammer abusing Microsoft's msonlineservicesteam@ for spam distribution

https://infosec.exchange/@spamhaus/116601270466207765
2•gnabgib•25m ago•0 comments

Almost Every Angband Variant – Play Online

https://angband.live/
1•SubiculumCode•28m ago•0 comments

Pedfs

https://pedfs.com/
1•rafaelcara•28m ago•0 comments

HN: Updating our Databases on AniTroves to provide biggest Anime, Manga database

1•anitroves•28m ago•0 comments

The Silence of the Dying

https://web.archive.org/web/20180930034452/http://nonsuchkitchengardens.com/2010/05/the-silence-o...
2•notknifescience•31m ago•1 comments

Robotic beehives in Florida claim 70% reduction in colony collapse

https://www.foxnews.com/science/ai-robotic-beehives-installed-florida-community-claim-70-reductio...
2•gscott•38m ago•0 comments

A simple AI agent in Java

https://github.com/machineswillrise/jagent
1•onesingleblast•42m ago•0 comments

Scan any codebase in 3s, then verify what your AI builds

https://github.com/anatomia-dev/anatomia
2•stealthyAF•47m ago•0 comments

Joe Rogan accidentally exposed AI in four words [video][12 mins]

https://www.youtube.com/watch?v=waFl4uBfXRA
2•Bender•52m ago•0 comments

Extending MySQL with VillageSQL

https://maxdemarzi.com/2026/05/21/extending-mysql-with-villagesql/
1•maxdemarzi•54m ago•0 comments

Microsoft open-sources "the earliest DOS source code discovered to date"

https://arstechnica.com/gadgets/2026/04/microsoft-open-sources-the-earliest-dos-source-code-disco...
33•DamnInteresting•56m ago•3 comments

Show HN: Play nbsdgames to increase your brain (exclamation mark)

https://github.com/abakh/nbsdgames
2•abakh•1h ago•0 comments

Complexity Has to Live Somewhere (2020)

https://ferd.ca/complexity-has-to-live-somewhere.html
1•vinhnx•1h ago•1 comments

AI didn't kill your junior pipeline. You did

https://andrewmurphy.io/blog/ai-didnt-kill-your-junior-pipeline-you-did
7•MBCook•1h ago•2 comments

Meta Sam 3: Segment Anything with Text, Clicks and Concepts

https://sam3ai.com/
3•wslh•1h ago•0 comments

Guy Won the Anthropic Hackathon Solo. Then He Open-Sourced the Stack

https://old.reddit.com/r/AIAgentsInAction/comments/1t84rlc/this_guy_won_the_anthropic_hackathon_s...
2•thomasjudge•1h ago•0 comments

AI Headshot Generator – Preview Before You Pay, $4.99 One-Time

https://aiheadshotgenerator.pro/
1•xiaomohaha•1h ago•0 comments

Suspect killed after opening fire on Secret Service agents near White House

https://www.bbc.com/news/live/c5y09vpe713t
13•berlianta•1h ago•0 comments

Scammers are abusing an internal Microsoft account to send spam links

https://techcrunch.com/2026/05/21/scammers-are-abusing-an-internal-microsoft-account-to-send-spam/
21•spike021•1h ago•3 comments