Function setattrofunc 

pub unsafe extern "C" fn setattrofunc<Meth: MethodDef<Func>>(
    slf: *mut PyObject,
    attr: *mut PyObject,
    value: *mut PyObject,
) -> c_int

External symbol called by Python, which calls the provided Rust function.

The Rust function is supplied via the generic parameter Meth.

Safety

The interpreter must be attached