Simon Willison on micropython

9 posts tagged “micropython”

MicroPython is "a lean and efficient implementation of the Python 3 programming language"

2026

I added a CLI to micropython-wasm (issue #7), inspired by the first draft of the blog entry when I realized it would be a great way to illustrate the Try it yourself section.

6th Jun 2026, 4:26 am · python, sandboxing, webassembly, micropython

Running Python code in a sandbox with MicroPython and WASM

I’ve been experimenting with different approaches to running code in a sandbox for several years now, but my latest attempt feels like it might finally have all of the characteristics I’ve been looking for. I’ve released it as an alpha package called micropython-wasm, and I’m using it for a code execution sandbox plugin for Datasette Agent called datasette-agent-micropython.

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3:53 am / 6th June 2026 / python, sandboxing, ai, datasette, webassembly, generative-ai, llms, ai-assisted-programming, codex, datasette-agent, micropython

Release datasette-agent-micropython 0.1a0

I want Datasette Agent to be able to generate and execute Python code safely. This alpha is looking promising so far. GPT-5.5 has so far failed to break out of the sandbox!

2nd Jun 2026, 7:28 pm · python, sandboxing, datasette, webassembly, datasette-agent, micropython

Release micropython-wasm 0.1a1

Fixes for some limitations that emerged while I was trying to use this to build datasette-agent-micropython.

2nd Jun 2026, 7:20 pm · python, sandboxing, webassembly, micropython

Release micropython-wasm 0.1a0

My latest sandboxing experiment: This alpha package bundles a lightly customized WASM build of MicroPython with a wrapper to execute code in it via wasmtime.

2nd Jun 2026, 3:43 am · python, sandboxing, webassembly, micropython

2025

Hacking the WiFi-enabled color screen GitHub Universe conference badge

I’m at GitHub Universe this week (thanks to a free ticket from Microsoft). Yesterday I picked up my conference badge... which incorporates a ~~full Raspberry Pi~~ Raspberry Pi Pico microcontroller with a battery, color screen, WiFi and bluetooth.

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5:17 pm / 28th October 2025 / github, hardware-hacking, microsoft, ai, generative-ai, raspberry-pi, llms, claude-code, disclosures, micropython

Tool Badge Interactive REPL — Interact with a MicroPython device via the Web Serial API to execute Python commands in real-time through a browser-based REPL interface. This tool enables direct communication with compatible microcontroller boards, allowing users to run Python code, query system information, and manage files without requiring terminal software or drivers. The interface provides quick-access buttons for common operations like listing files, checking CPU frequency, and monitoring available memory.

27th Oct 2025, 10:54 pm · micropython

Tool MicroPython Code Executor — Execute Python code in a sandboxed MicroPython WebAssembly environment with output displayed in real-time. Code is automatically saved to the URL for convenient sharing and persistence, and the environment supports JavaScript interoperability including the `fetch()` API for making HTTP requests. Built-in examples demonstrate common programming patterns from basic operations to working with APIs.

25th Sep 2025, 3:44 pm · webassembly, micropython

2022

PyScript Updates: Bytecode Alliance, Pyodide, and MicroPython. Absolutely huge news about Python on the Web tucked into this announcement: Anaconda have managed to get a version of MicroPython compiled to WebAssembly running in the browser. Pyodide weighs in at around 6.5MB compressed, but the MicroPython build is just 303KB—the size of a large image. This makes Python in the web browser applicable to so many more potential areas.

# 9th November 2022, 10:26 pm / python, webassembly, pyodide, micropython

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