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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•11mo 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!

Show HN: DeckWeaver – Create AI-powered Google Slides presentations in minutes

https://usedeckweaver.com/
1•BjoernKW•12s ago•0 comments

Ask HN: Favourite Assembly Instructions?

1•RetroTechie•1m ago•0 comments

Humanoid robots race past humans in Beijing half-marathon,showing rapid advances

https://www.reuters.com/sports/humanoid-robots-race-past-humans-beijing-half-marathon-showing-rap...
1•teleforce•5m ago•0 comments

Musk Defrauded Tesla Customers

https://twitter.com/RealDanODowd/status/2047076407705264227
2•doener•9m ago•0 comments

How to Stop a Data Center in Your Backyard

https://lataco.com/stop-sgv-data-center-building
2•cdrnsf•12m ago•0 comments

Show HN: Bro Skills – address the daily gaps your agents still struggle with

https://github.com/backnotprop/bro-skills
1•ramoz•13m ago•0 comments

Metrics SQL: A SQL-based semantic layer for humans and agents

https://www.rilldata.com/blog/introducing-metrics-sql-a-sql-based-semantic-layer-for-humans-and-a...
1•teleforce•14m ago•0 comments

Show HN: Ecstatic Dance Aggregator for worldwide wellness events

https://ecstatic.events
1•kinnth•15m ago•0 comments

Mars or the Moon or A.I.? Elon Musk's Changing Goals for SpaceX

https://www.nytimes.com/2026/04/22/technology/elon-musk-spacex-ipo-goals.html
1•doener•15m ago•1 comments

A good AGENTS.md is a model upgrade. A bad one is worse than no docs at all

https://www.augmentcode.com/blog/how-to-write-good-agents-dot-md-files
2•knes•20m ago•0 comments

Islam Is Not the Cause of Honor Killings. It's Part of the Solution

https://yaqeeninstitute.org/read/paper/islam-is-not-the-cause-of-honor-killings-its-part-of-the-s...
5•pongping•22m ago•0 comments

Kalshi suspends 3 US congressional candidates for 'political insider trading'

https://www.reuters.com/world/us/kalshi-suspends-three-us-congressional-candidates-political-insi...
5•alephnerd•23m ago•1 comments

See your name written in landscapes captured by Landsat

https://science.nasa.gov/specials/your-name-in-landsat/
3•wilson090•24m ago•0 comments

An AI-gile Manifesto (2026-2030)

https://www.elitesoftwareengineer.com/blog/the-aigile-manifesto-2026-2030
1•mikecamara•24m ago•0 comments

BendersLib: A Benders Decomposition Library in Python

1•guopenghui•25m ago•0 comments

Many anti-AI arguments are conservative arguments

https://www.seangoedecke.com/many-anti-ai-arguments-are-conservative/
3•mwcampbell•30m ago•0 comments

Serving the For You Feed

https://atproto.com/blog/serving-the-for-you-feed
1•lonk11•33m ago•1 comments

Cursor for LibreOffice, Week 4-6

https://keithcu.com/wordpress/?p=5245
2•keithcu2•33m ago•0 comments

Opus 4.7 Part 3: Model Welfare

https://www.lesswrong.com/posts/gD3bEgMo878eCHGbw/opus-4-7-part-3-model-welfare
7•omer_k•34m ago•0 comments

CSAI Foundation Launched with Mission of "Securing the Agentic Control Plane"

https://cloudsecurityalliance.org/press-releases/2026/03/23/csa-securing-the-agentic-control-plane
1•mooreds•35m ago•0 comments

Desmond Morris, 98, Dies; Zoologist Saw Links Between Humans and Apes

https://www.nytimes.com/2026/04/20/science/desmond-morris-dead.html
5•bookofjoe•36m ago•1 comments

Show HN: Algorithmic String Art, accessible to all

https://string-loom.pages.dev
2•s_e__a___n•37m ago•1 comments

Optimizing Effective Training Time for Meta's Recommendation/Ranking Workloads

https://pytorch.org/blog/optimizing-effective-training-time-for-metas-internal-recommendation-ran...
1•gmays•38m ago•0 comments

Another NPM supply chain worm is tearing through dev environments

https://www.theregister.com/2026/04/22/another_npm_supply_chain_attack/
3•omer_k•39m ago•0 comments

Anthropic Economic Index Survey

https://www.anthropic.com/research/economic-index-survey-announcement
1•etothet•42m ago•0 comments

SpaceX preempted a $2B fundraise with a $60B buyout offer

https://techcrunch.com/2026/04/22/how-spacex-preempted-a-2b-fundraise-with-a-60b-buyout-offer/
1•evo_9•43m ago•0 comments

The Surprising Self-Doubts of One of the Most Famous Artists in History

https://christopherpjones.substack.com/p/the-surprising-self-doubts-of-one
2•herbertl•44m ago•0 comments

Former congressman Devin Nunes departs as CEO of Trump media company

https://www.washingtonpost.com/politics/2026/04/22/devin-nunes-leaves-truth-social/
2•doener•44m ago•0 comments

Analytical and Predictive Study on Technological Dynamics in IT Market

https://www.researchgate.net/publication/399987524_Analytical_and_Predictive_Study_on_Technologic...
1•f0r3st•46m ago•0 comments

The Necessities Underlying Reality

https://www.bloomsburycollections.com/monograph?docid=b-9781350467101
1•danielam•47m ago•0 comments