Cross the Atlantic by running Python from JavaScript.

The underlying protocol is a forked and trimmed version of JSPyBridge's pythonia package.

Alterations include:

• Running from a browser context.
• Communicating via a WebSocket instead of a IO stream or pipe.
• Relies on the server being available already rather than spawned on first use.
• Built-in and transparent support for Python's asyncio.

This package does not yet supported connections over the internet; the intended use is in suites where the same localhost is available to both the browser and Python runtime.

This tool is both a JS package and Python package. In JS environments, note that this package requires support for ES2017 and above. Transpilation, due to how it handles async / await, is not guaranteed to work.

$ poetry add git+https://github.com/thearchitector/mayflower.git
$ yarn add mayflower@[email protected]:thearchitector/mayflower.git

To start the websocket server, you can invoke mayflower as a module: python -m mayflower. Using the package in browser will automatically start the websocket client and listen.

For unified applications, like using this tool to invoke Python utilities with a Cypress suite, it's recommended to use concurrently to ensure cleanup happens if the websocket fails / disconnects:

$ yarn add concurrently
# -u is required for Python to flush logs to stdout / stderr
$ concurrently "python -um mayflower" "cypress open"

See the JSPyBridge documentation for the syntactical sugar.

This package is license under BSD-3-Clause.

JSPyBridge, which this package is based on, is licensed under MIT.