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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!

Banks pay backhanded compliments to private credit

https://www.semafor.com/article/07/21/2026/banks-pay-backhanded-compliments-to-private-credit
1•petethomas•20s ago•0 comments

The Subprime Data Center Crisis

https://www.wheresyoured.at/the-subprime-data-center-crisis/
1•crescit_eundo•28s ago•0 comments

I used ChatGPT to sue a Norwegian airline from New York and get $4760

https://www.behind-the-enemy-lines.com/2026/07/the-lawyer-i-never-hired-how-chatgpt.html
1•Panos•32s ago•0 comments

Polio should have been eradicated by now. What's plan B?

https://www.nature.com/articles/d41586-026-02229-6
1•Brajeshwar•47s ago•0 comments

Project: Tether

https://devz.cl/posts/axiom-proper-project-tether/
1•DanielVZ•1m ago•0 comments

DuckDB Internals: Why Is DuckDB Fast? (Part 2 Vectorized Execution)

https://www.greybeam.ai/blog/duckdb-internals-part-2
1•hornyforsavings•2m ago•0 comments

Sneaky Windows stealer targets 300 apps, gives crims AI profiler to max profits

https://www.theregister.com/security/2026/07/22/sneaky-windows-stealer-targets-300-apps-gives-cri...
1•Bender•2m ago•0 comments

Software Apprenticeship Was Accidental

https://caffeinatedcode.com/posts/software-apprenticeship-was-accidental/
1•abnercoimbre•3m ago•0 comments

CLI for Proton Drive now available

https://github.com/ProtonDriveApps/sdk/blob/main/cli/README.md
1•schnittbrot•3m ago•1 comments

Layoffs.FYI Adds new AI attribution layoff chart

https://layoffs.fyi/
1•rickcarlino•3m ago•0 comments

Is BPC-157 legal in 2026? What the FDA found

https://www.empirical.health/blog/bpc-157-fda-review/
1•brandonb•3m ago•0 comments

MCP tool calling under the hood

https://jeffauriemma.leaflet.pub/3mraol7ln622u
1•jdauriemma•3m ago•0 comments

Unlimited AI tokens aren't unlimited after all as US Army burns through supply

https://arstechnica.com/ai/2026/07/us-army-faces-ai-use-limits-after-exhausting-years-supply-of-a...
2•Bender•3m ago•0 comments

What happens when you try to chop a photon in half?

https://arstechnica.com/science/2026/07/what-happens-when-you-try-to-chop-a-photon-in-half/
2•Bender•4m ago•0 comments

Scientists Gave Mice Cocaine. This Is What It Did to Their Brains

https://www.404media.co/mice-cocaine-research-addiction-fens-forum/
1•gmays•4m ago•0 comments

Topcoat: A framework for building full-stack reactive web apps with Rust

https://tokio.rs/blog/2026-07-22-announcing-topcoat
1•carllerche•4m ago•1 comments

We probed a pinned GPT-5.5 endpoint: every request carried ~1,447 hidden tokens

https://tosea.ai/blog/prompt-injection-llm-fingerprint-drift
1•opwizardx•4m ago•0 comments

Manticore Search under systemd: beyond fork, PID files, and guesswork

https://manticoresearch.com/blog/systemd_integration/
1•snikolaev•6m ago•0 comments

A Fast Path for Fixed-Length Lists in Parquet

https://www.morling.dev/blog/fast-path-for-fixed-length-lists-in-parquet/
1•gunnarmorling•6m ago•0 comments

Proofs

https://home.omg.lol/info/proofs
2•Tomte•8m ago•0 comments

Wordit – Now in Pt-Br

https://wordit.org/pt-br/
1•atum47•11m ago•1 comments

Mac Studio: Should You Buy? Or Wait?

https://www.macrumors.com/roundup/mac-studio/
1•adithyaharish•13m ago•1 comments

Electric aviation is taking off

https://www.economist.com/science-and-technology/2026/07/22/electric-aviation-is-taking-off
1•Brajeshwar•13m ago•0 comments

I Had 11 AI Subagents Test Every PPTX Skill for Claude Code. Here's What Works

https://www.bulaev.net/p/i-had-11-ai-subagents-test-every
1•sbulaev•14m ago•0 comments

Show HN: blackbar-nano – local PII detection and redaction on CPU

https://github.com/safetype/blackbar-nano
1•My24HR•14m ago•0 comments

Launch HN: Unlayer (YC W22) – Add email and document builders to your app

https://unlayer.com
7•adeelraza•15m ago•2 comments

Denying the Worm

https://www.crowdstrike.com/en-us/blog/denying-the-worm-sandworm-mode-and-ai-toolchain-supply-cha...
1•yruzin•16m ago•0 comments

Intelligent MFA in FusionAuth: Smarter Security Without the Friction [video]

https://www.youtube.com/watch?v=WwVH_ODLIJU
1•mooreds•17m ago•0 comments

MySQL 9.7 Community Edition: Smarter Join Planning with the Hypergraph Optimizer

https://blogs.oracle.com/mysql/smarter-join-planning-with-the-hypergraph-optimizer
1•ksec•17m ago•0 comments

Building the Grace Cathedral Experience

https://blog.playcanvas.com/building-the-grace-cathedral-experience/
1•ovenchips•19m ago•0 comments