Mapping SQLite Result Columns Back to Their Source table.column
Simon Willison's Weblog7 hours agoTutorialSimon Willison explored how to programmatically map SQLite query result columns back to their source table and column names — a capability that would let Datasette enrich query results with contextual metadata. He tasked Claude Code (Opus 4.8) with finding solutions, which surfaced three approaches: using the apsw library, calling SQLite's sqlite3_column_table_name() C function via Python ctypes, and parsing EXPLAIN bytecode output. The research is published as a GitHub README and covers the tradeoffs of each technique.
asyncinject 0.7 Released After Claude Fable 5 Bug Fixes
Simon Willison's Weblog3 days agoReleaseSimon Willison announced asyncinject 0.7, a release of his Python utility library for an asyncio dependency injection pattern. He originally built the library a few years ago and has used it with Datasette. The notable angle is that Claude Fable 5 spotted bugs in the dependency and fixed them, which Willison describes as unusually proactive behavior.
micropython-wasm 0.1a2
Simon Willison's Weblog8 days agoReleaseSimon Willison released micropython-wasm 0.1a2, with the main change being a new CLI. The CLI was added from issue #7 and was inspired while drafting a related post about MicroPython in a sandbox. Its purpose is to make the post's “Try it yourself” section easier to demonstrate and follow, especially for readers experimenting with Python, WebAssembly, and sandboxing.
Running Python code in a sandbox with MicroPython and WASM
Simon Willison's Weblog8 days agoNew ToolSimon Willison describes his latest attempt to safely run Python plugin-style code inside his own applications. The alpha package micropython-wasm uses MicroPython compiled to WebAssembly, executed through the maintained wasmtime Python library. His goals include clean PyPI installation, CPU and memory limits, controlled file and network access, host functions, and reliable documentation.
datasette-agent-micropython 0.1a0
Simon Willison's Weblog11 days agoReleaseSimon Willison released datasette-agent-micropython 0.1a0, an alpha aimed at letting Datasette Agent generate and execute Python safely. The project focuses on sandboxing, with MicroPython and WebAssembly-related techniques suggested by the tags. Willison says the early results look promising and that GPT-5.5 has not yet escaped the sandbox, though this remains an early alpha.
micropython-wasm 0.1a1
Simon Willison's Weblog11 days agoReleaseSimon Willison released micropython-wasm 0.1a1, a small update connected to Python, sandboxing, and WebAssembly. The release fixes limitations that appeared while he was trying to use it to build datasette-agent-micropython. The post does not list detailed changes, so this should be read as an early usability and compatibility improvement rather than a major feature launch.
micropython-wasm 0.1a0
Simon Willison's Weblog12 days agoReleaseSimon Willison released micropython-wasm 0.1a0, an alpha package described as his latest sandboxing experiment. It bundles a lightly customized WASM build of MicroPython with a wrapper for executing code through wasmtime. The post is brief, but relevant to developers tracking Python sandboxing, WebAssembly runtimes, and controlled execution environments.
Running Python ASGI Apps in the Browser via Pyodide + a Service Worker
Simon Willison's Weblog14 days agoTutorialSimon Willison demonstrates an experiment for running Python ASGI apps entirely in the browser using Pyodide and a Service Worker. The approach addresses a Datasette Lite limitation: HTML returned through intercepted navigation did not execute script tags, breaking features and plugins. Claude Opus 4.8, used through Claude Code for web, helped explore the implementation. Basic ASGI and Datasette 1.0a31 demos are available.
pydantic-monty investigation
Simon Willison's Weblog22 days agoCommentarySimon Willison revisited pydantic-monty, a sandboxed subset of Python implemented in Rust. He asked Claude Code to inspect the most recent release, following his earlier exploration a few months ago. The key finding is that limits for execution duration, memory, allocations, and recursion depth all appear to behave as advertised.
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