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    about

    web-python is a web-based Python interpreter powered by Pyodide, leveraging its experimental local directory mounting feature to sync the WASM filesystem with a local writable directory.

    This feature is not yet available on all browsers. See documentation for showDirectoryPicker for more information.

    usage

    Select a local directory, enter arguments for the Python interpreter (e.g. main.py arg1 arg2), and click Run. The arguments field suggests .py files from your project as you type.

    To run a one-liner without a directory, use the -c flag: -c "print('hello world!')"

    importing from GitHub

    Click "Import from GitHub" to fetch a public repository. Accepted formats: 

    user/repo
user/repo@branch
https://github.com/user/repo
https://github.com/user/repo/tree/branch
https://github.com/user/repo/tree/branch/sub/dir

    If a local directory is mounted the files are written there (persisted to disk). Otherwise they are loaded into the interpreter's in-memory filesystem for the current session. main.py is auto-selected in the arguments field after a successful import.

    keyboard shortcuts

    Ctrl+Enter / Cmd+Enter — Run (from the arguments field)
    Ctrl+L / Cmd+L — Clear terminal
    Ctrl+Wheel — Zoom terminal font size
    ↑ / ↓ — Navigate file suggestions
    Escape — Dismiss file suggestions

    using external packages

    Dependencies are read from requirements.txt and/or pyproject.toml in your project root and installed via micropip before each run. Both files are merged if present; reinstall only happens when either file changes.

    requirements.txt — one package per line: 

    numpy
pandas>=2.0
matplotlib

    pyproject.toml — PEP 621 and Poetry formats: 

    # PEP 621
[project]
dependencies = ["numpy", "pandas>=2.0"]

# Poetry
[tool.poetry.dependencies]
numpy = "*"
pandas = "^2.0"

    Not all PyPI packages are compatible with Pyodide's WebAssembly environment. See the list of supported packages.

    issues

    Questions, bugs, or feature requests — open an issue on GitHub.

    disclaimer

    web-python is an independent project and is not affiliated with or endorsed by the Python Software Foundation (PSF). The Python logo is a trademark of the PSF, used here under the trademark usage policy.

    import from GitHub

    Fetch a public GitHub repository into the interpreter. Accepted formats: 

    user/repo
user/repo@branch
https://github.com/user/repo
https://github.com/user/repo/tree/branch
https://github.com/user/repo/tree/branch/sub/dir

    Files are loaded into the interpreter's in-memory filesystem for the current session.

    repository