def _check_fringe(fringe):
    assert isinstance(fringe, list)
    assert 1 >= len(fringe)
    for v in fringe:
        assert isinstance(v, tuple)
        assert len(v) == 2
        assert isinstance(v[0], float)
        assert isinstance(v[1], float)
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/core/modules/module_registry.py/_check_fringe/swapped operands of `>=`