In this case the solution is to use Anonymous union literals.

const py = @cImport({
    @cInclude("Python.h");
});

var pyObject = py.PyObject{
    .unnamed_0 = .{ .ob_refcnt = 1 },
    .ob_type = null,
};

// main fn and stuff..

If the type was a struct, an Anonymous struct literal could be used instead.