Method test_update

networkx/classes/tests/test_graph.py:783–853

(self)

        assert G.get_edge_data(-1, 0, default=1) == 1

    def test_update(self):
        # specify both edges and nodes
        G = self.K3.copy()
        G.update(nodes=[3, (4, {"size": 2})], edges=[(4, 5), (6, 7, {"weight": 2})])
        nlist = [
            (0, {}),
            (1, {}),
            (2, {}),
            (3, {}),
            (4, {"size": 2}),
            (5, {}),
            (6, {}),
            (7, {}),
        ]
        assert sorted(G.nodes.data()) == nlist
        if G.is_directed():
            elist = [
                (0, 1, {}),
                (0, 2, {}),
                (1, 0, {}),
                (1, 2, {}),
                (2, 0, {}),
                (2, 1, {}),
                (4, 5, {}),
                (6, 7, {"weight": 2}),
            ]
        else:
            elist = [
                (0, 1, {}),
                (0, 2, {}),
                (1, 2, {}),
                (4, 5, {}),
                (6, 7, {"weight": 2}),
            ]
        assert sorted(G.edges.data()) == elist
        assert G.graph == {}

        # no keywords -- order is edges, nodes
        G = self.K3.copy()
        G.update([(4, 5), (6, 7, {"weight": 2})], [3, (4, {"size": 2})])
        assert sorted(G.nodes.data()) == nlist
        assert sorted(G.edges.data()) == elist
        assert G.graph == {}

        # update using only a graph
        G = self.Graph()
        G.graph["foo"] = "bar"
        G.add_node(2, data=4)
        G.add_edge(0, 1, weight=0.5)
        GG = G.copy()
        H = self.Graph()
        GG.update(H)
        assert graphs_equal(G, GG)
        H.update(G)
        assert graphs_equal(H, G)

        # update nodes only
        H = self.Graph()