def test_order_len_equivlance(self):
        gr = testlib.new_hypergraph()
        assert len(gr) == gr.order()
        assert gr.order() == len( gr.node_links )
The inverse of a vector is a negative in all elements.
dataset/ETHPy150Open pmatiello/python-graph/tests/unittests-hypergraph.py/test_hypergraph.test_order_len_equivlance--crossover with--dataset/ETHPy150Open hhatto/autopep8/test/vectors_example.py/V.__neg__