Version: 1.1.0

Calling Mojo from Python

Mojo functions can be exported so Python can import them like a native extension.

Essentials

Mark the function for export and build the package with the Mojo tool.
Stick to types that have a Python equivalent at the boundary: numbers, strings, and exported structs.
The Python process owns the call. Mojo code runs underneath it.
Raise Mojo errors to fail the Python call.

from python import PythonObject

def add(a: PythonObject, b: PythonObject) -> PythonObject:
    return a + b

Export a small surface. Large object graphs are easier to keep on one side of the boundary.