def METHOD_NAME():
    """Each is tuple (cls_obj, param attr, lis(param values), eval func)."""
    list_ext_params = []
    list_ext_params.append(
        (hoomd.md.external.field.Periodic, "params",
         list([dict(A=1.5, i=1, w=3.5, p=5),
               dict(A=10, i=0, w=3.4, p=2)]), _evaluate_periodic))
    list_ext_params.append(
        (hoomd.md.external.field.Electric, "E", list([
            (1, 0, 0),
            (0, 2, 0),
        ]), _evaluate_electric))
    return list_ext_params