Macro pyo3::wrap_pyfunction

macro_rules! wrap_pyfunction {
    ($function_name: ident) => { ... };
    ($function_name: ident, $arg: expr) => { ... };
}

Wraps a Rust function annotated with #[pyfunction], turning it into a PyCFunction.

This can be used with PyModule::add_function to add free functions to a PyModule - see its documention for more information.