Starting Python in your browser. The first visit downloads the Python runtime and libraries from a public CDN; later visits load them from the browser cache. Your files are read inside this browser and are not uploaded anywhere.
This demo runs Python inside your browser with WebAssembly and module workers. This browser does not support them or has them switched off, or the runtime could not be downloaded.
Try a current version of Chrome, Edge, Firefox or Safari, look at the screenshots below, or run the app yourself: uv sync and uv run data-explorer run, or docker build -t data-explorer . and docker run -p 8501:8501 data-explorer.