Running Python code in a sandbox with MicroPython and WASM

Article excerpt

Simon Willison explores how to safely execute untrusted Python code by combining MicroPython with WebAssembly, creating an isolated sandbox that prevents malicious scripts from accessing the host system. The approach leverages MicroPython's lightweight design and WASM's inherent security boundaries to run Python in a restricted environment. This technique addresses a real problem for developers who need to allow user-submitted code execution without risking system compromise. The post walks through the technical implementation and trade-offs of the sandbox approach.