Running Python code in a sandbox with MicroPython and WASM

A new way to lock Python in a safe has commenters curious, skeptical, and already nitpicking

TLDR: A developer released an early tool meant to let Python scripts run safely inside apps without full access to your files, internet, or system. Commenters were split between “finally, useful!” and “wait, what’s the real use case?”, with side chatter about rival tools and even typo humor stealing some spotlight.

A developer has unveiled an early test version of a tool that runs Python code inside a tightly controlled box, with the big promise being simple: let people use add-ons and mini scripts without giving them the keys to the whole house. The idea is to stop rogue or buggy code from snooping through files, making surprise internet calls, or gobbling up all your computer’s power. In plain English, it’s about letting users do clever custom stuff without the usual "this could wreck everything" anxiety.

But the real fun is in the comment section, where the crowd instantly split into familiar internet factions: the intrigued, the confused, and the “have you tried this other thing?” brigade. One commenter wandered in like it was destiny, saying they had literally been searching for “sandboxed Python” and found the post the same day — a very online meet-cute. Another delivered the coldest reality check of the thread: they were struggling to think of an actual use for it at all, suggesting maybe beginners could play with it in the browser but otherwise asking, essentially, who is this even for? That skepticism became the thread’s hottest low-key drama.

Then came the classic tech-forum side quests. Someone name-dropped Judge0 as the alternative you’re apparently supposed to consider before reinventing anything. Another commenter got distracted by a typo in the author’s shared chat log and turned the whole thing into a tiny comedy roast about how even messy prompts still work. And finally, a drive-by question about Monty appeared, because no tech thread is complete without someone casually summoning another tool nobody else was discussing.

Key Points

  • The article introduces an alpha package called micropython-wasm for sandboxed Python code execution using MicroPython and WebAssembly.
  • The immediate use case is a code-execution sandbox plugin for Datasette Agent named datasette-agent-micropython.
  • The author’s motivation is to reduce the risk of Python plugin systems that currently execute with full privileges via Pluggy.
  • The article defines key sandbox requirements including PyPI-friendly installation, CPU and memory limits, controlled file and network access, and host-function integration.
  • WebAssembly, used through the wasmtime Python library, is presented as a more suitable embedding and isolation approach than JavaScript engine options such as V8.

Hottest takes

"I am trying to think of a use case for this." — tmaly
"Very nice coincidence! Thanks." — theanonymousone
"glad to see I'm not the only one that send typos" — hmokiguess
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