Python REPL

A plain offline Python REPL (CPython via Pyodide) in a popup. math, random, statistics preloaded.

Python REPL in a small toolbar popup for quick calculations without leaving the tab. Click the toolbar icon (or press Alt+Shift+P) and enter commands in the Python REPL prompt. CPython 3.14 compiled to WebAssembly (Pyodide), running on your device with math, random and statistics already imported. Features • Real CPython console: >>> and ... prompts, multi-line blocks, standard tracebacks. • Tab completion with a filter-as-you-type menu. • Input history (Up/Down), Ctrl-L to clear, Ctrl-C to interrupt a long execution. • Copy last result with a shortcut (Cmd-C on macOS, Ctrl-Shift-C elsewhere) when nothing is selected so everything can be done without the mouse. • Variables and scrollback persist until a browser restart or exit() / Ctrl-D. • Follows system light / dark theme. Private and Offline • No network: Python runtime and standard library bundled in the extension and nothing is downloaded. Extension security policy blocks network requests. • No data collected / analytics / login. • No access to your tabs or the pages you visit: the only permission is "offscreen", which keeps the interpreter running while the popup is closed. • Nothing saved to disk; the session lives in memory. Limitations • Standard library only and trimmed to what the console and the pre-imported modules need. No third-party packages and no pip/micropip. Open source (MIT): https://github.com/erikus/chrome-repl