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+import pytest
+
+import networkx as nx
+from networkx.generators.classic import empty_graph
+from networkx.utils import edges_equal, nodes_equal
+
+
+class TestRelabel:
+ def test_convert_node_labels_to_integers(self):
+ # test that empty graph converts fine for all options
+ G = empty_graph()
+ H = nx.convert_node_labels_to_integers(G, 100)
+ assert list(H.nodes()) == []
+ assert list(H.edges()) == []
+
+ for opt in ["default", "sorted", "increasing degree", "decreasing degree"]:
+ G = empty_graph()
+ H = nx.convert_node_labels_to_integers(G, 100, ordering=opt)
+ assert list(H.nodes()) == []
+ assert list(H.edges()) == []
+
+ G = empty_graph()
+ G.add_edges_from([("A", "B"), ("A", "C"), ("B", "C"), ("C", "D")])
+ H = nx.convert_node_labels_to_integers(G)
+ degH = (d for n, d in H.degree())
+ degG = (d for n, d in G.degree())
+ assert sorted(degH) == sorted(degG)
+
+ H = nx.convert_node_labels_to_integers(G, 1000)
+ degH = (d for n, d in H.degree())
+ degG = (d for n, d in G.degree())
+ assert sorted(degH) == sorted(degG)
+ assert nodes_equal(H.nodes(), [1000, 1001, 1002, 1003])
+
+ H = nx.convert_node_labels_to_integers(G, ordering="increasing degree")
+ degH = (d for n, d in H.degree())
+ degG = (d for n, d in G.degree())
+ assert sorted(degH) == sorted(degG)
+ assert H.degree(0) == 1
+ assert H.degree(1) == 2
+ assert H.degree(2) == 2
+ assert H.degree(3) == 3
+
+ H = nx.convert_node_labels_to_integers(G, ordering="decreasing degree")
+ degH = (d for n, d in H.degree())
+ degG = (d for n, d in G.degree())
+ assert sorted(degH) == sorted(degG)
+ assert H.degree(0) == 3
+ assert H.degree(1) == 2
+ assert H.degree(2) == 2
+ assert H.degree(3) == 1
+
+ H = nx.convert_node_labels_to_integers(
+ G, ordering="increasing degree", label_attribute="label"
+ )
+ degH = (d for n, d in H.degree())
+ degG = (d for n, d in G.degree())
+ assert sorted(degH) == sorted(degG)
+ assert H.degree(0) == 1
+ assert H.degree(1) == 2
+ assert H.degree(2) == 2
+ assert H.degree(3) == 3
+
+ # check mapping
+ assert H.nodes[3]["label"] == "C"
+ assert H.nodes[0]["label"] == "D"
+ assert H.nodes[1]["label"] == "A" or H.nodes[2]["label"] == "A"
+ assert H.nodes[1]["label"] == "B" or H.nodes[2]["label"] == "B"
+
+ def test_convert_to_integers2(self):
+ G = empty_graph()
+ G.add_edges_from([("C", "D"), ("A", "B"), ("A", "C"), ("B", "C")])
+ H = nx.convert_node_labels_to_integers(G, ordering="sorted")
+ degH = (d for n, d in H.degree())
+ degG = (d for n, d in G.degree())
+ assert sorted(degH) == sorted(degG)
+
+ H = nx.convert_node_labels_to_integers(
+ G, ordering="sorted", label_attribute="label"
+ )
+ assert H.nodes[0]["label"] == "A"
+ assert H.nodes[1]["label"] == "B"
+ assert H.nodes[2]["label"] == "C"
+ assert H.nodes[3]["label"] == "D"
+
+ def test_convert_to_integers_raise(self):
+ with pytest.raises(nx.NetworkXError):
+ G = nx.Graph()
+ H = nx.convert_node_labels_to_integers(G, ordering="increasing age")
+
+ def test_relabel_nodes_copy(self):
+ G = nx.empty_graph()
+ G.add_edges_from([("A", "B"), ("A", "C"), ("B", "C"), ("C", "D")])
+ mapping = {"A": "aardvark", "B": "bear", "C": "cat", "D": "dog"}
+ H = nx.relabel_nodes(G, mapping)
+ assert nodes_equal(H.nodes(), ["aardvark", "bear", "cat", "dog"])
+
+ def test_relabel_nodes_function(self):
+ G = nx.empty_graph()
+ G.add_edges_from([("A", "B"), ("A", "C"), ("B", "C"), ("C", "D")])
+ # function mapping no longer encouraged but works
+
+ def mapping(n):
+ return ord(n)
+
+ H = nx.relabel_nodes(G, mapping)
+ assert nodes_equal(H.nodes(), [65, 66, 67, 68])
+
+ def test_relabel_nodes_callable_type(self):
+ G = nx.path_graph(4)
+ H = nx.relabel_nodes(G, str)
+ assert nodes_equal(H.nodes, ["0", "1", "2", "3"])
+
+ @pytest.mark.parametrize("non_mc", ("0123", ["0", "1", "2", "3"]))
+ def test_relabel_nodes_non_mapping_or_callable(self, non_mc):
+ """If `mapping` is neither a Callable or a Mapping, an exception
+ should be raised."""
+ G = nx.path_graph(4)
+ with pytest.raises(AttributeError):
+ nx.relabel_nodes(G, non_mc)
+
+ def test_relabel_nodes_graph(self):
+ G = nx.Graph([("A", "B"), ("A", "C"), ("B", "C"), ("C", "D")])
+ mapping = {"A": "aardvark", "B": "bear", "C": "cat", "D": "dog"}
+ H = nx.relabel_nodes(G, mapping)
+ assert nodes_equal(H.nodes(), ["aardvark", "bear", "cat", "dog"])
+
+ def test_relabel_nodes_orderedgraph(self):
+ G = nx.Graph()
+ G.add_nodes_from([1, 2, 3])
+ G.add_edges_from([(1, 3), (2, 3)])
+ mapping = {1: "a", 2: "b", 3: "c"}
+ H = nx.relabel_nodes(G, mapping)
+ assert list(H.nodes) == ["a", "b", "c"]
+
+ def test_relabel_nodes_digraph(self):
+ G = nx.DiGraph([("A", "B"), ("A", "C"), ("B", "C"), ("C", "D")])
+ mapping = {"A": "aardvark", "B": "bear", "C": "cat", "D": "dog"}
+ H = nx.relabel_nodes(G, mapping, copy=False)
+ assert nodes_equal(H.nodes(), ["aardvark", "bear", "cat", "dog"])
+
+ def test_relabel_nodes_multigraph(self):
+ G = nx.MultiGraph([("a", "b"), ("a", "b")])
+ mapping = {"a": "aardvark", "b": "bear"}
+ G = nx.relabel_nodes(G, mapping, copy=False)
+ assert nodes_equal(G.nodes(), ["aardvark", "bear"])
+ assert edges_equal(G.edges(), [("aardvark", "bear"), ("aardvark", "bear")])
+
+ def test_relabel_nodes_multidigraph(self):
+ G = nx.MultiDiGraph([("a", "b"), ("a", "b")])
+ mapping = {"a": "aardvark", "b": "bear"}
+ G = nx.relabel_nodes(G, mapping, copy=False)
+ assert nodes_equal(G.nodes(), ["aardvark", "bear"])
+ assert edges_equal(G.edges(), [("aardvark", "bear"), ("aardvark", "bear")])
+
+ def test_relabel_isolated_nodes_to_same(self):
+ G = nx.Graph()
+ G.add_nodes_from(range(4))
+ mapping = {1: 1}
+ H = nx.relabel_nodes(G, mapping, copy=False)
+ assert nodes_equal(H.nodes(), list(range(4)))
+
+ def test_relabel_nodes_missing(self):
+ G = nx.Graph([("A", "B"), ("A", "C"), ("B", "C"), ("C", "D")])
+ mapping = {0: "aardvark"}
+ # copy=True
+ H = nx.relabel_nodes(G, mapping, copy=True)
+ assert nodes_equal(H.nodes, G.nodes)
+ # copy=False
+ GG = G.copy()
+ nx.relabel_nodes(G, mapping, copy=False)
+ assert nodes_equal(G.nodes, GG.nodes)
+
+ def test_relabel_copy_name(self):
+ G = nx.Graph()
+ H = nx.relabel_nodes(G, {}, copy=True)
+ assert H.graph == G.graph
+ H = nx.relabel_nodes(G, {}, copy=False)
+ assert H.graph == G.graph
+ G.name = "first"
+ H = nx.relabel_nodes(G, {}, copy=True)
+ assert H.graph == G.graph
+ H = nx.relabel_nodes(G, {}, copy=False)
+ assert H.graph == G.graph
+
+ def test_relabel_toposort(self):
+ K5 = nx.complete_graph(4)
+ G = nx.complete_graph(4)
+ G = nx.relabel_nodes(G, {i: i + 1 for i in range(4)}, copy=False)
+ assert nx.is_isomorphic(K5, G)
+ G = nx.complete_graph(4)
+ G = nx.relabel_nodes(G, {i: i - 1 for i in range(4)}, copy=False)
+ assert nx.is_isomorphic(K5, G)
+
+ def test_relabel_selfloop(self):
+ G = nx.DiGraph([(1, 1), (1, 2), (2, 3)])
+ G = nx.relabel_nodes(G, {1: "One", 2: "Two", 3: "Three"}, copy=False)
+ assert nodes_equal(G.nodes(), ["One", "Three", "Two"])
+ G = nx.MultiDiGraph([(1, 1), (1, 2), (2, 3)])
+ G = nx.relabel_nodes(G, {1: "One", 2: "Two", 3: "Three"}, copy=False)
+ assert nodes_equal(G.nodes(), ["One", "Three", "Two"])
+ G = nx.MultiDiGraph([(1, 1)])
+ G = nx.relabel_nodes(G, {1: 0}, copy=False)
+ assert nodes_equal(G.nodes(), [0])
+
+ def test_relabel_multidigraph_inout_merge_nodes(self):
+ for MG in (nx.MultiGraph, nx.MultiDiGraph):
+ for cc in (True, False):
+ G = MG([(0, 4), (1, 4), (4, 2), (4, 3)])
+ G[0][4][0]["value"] = "a"
+ G[1][4][0]["value"] = "b"
+ G[4][2][0]["value"] = "c"
+ G[4][3][0]["value"] = "d"
+ G.add_edge(0, 4, key="x", value="e")
+ G.add_edge(4, 3, key="x", value="f")
+ mapping = {0: 9, 1: 9, 2: 9, 3: 9}
+ H = nx.relabel_nodes(G, mapping, copy=cc)
+ # No ordering on keys enforced
+ assert {"value": "a"} in H[9][4].values()
+ assert {"value": "b"} in H[9][4].values()
+ assert {"value": "c"} in H[4][9].values()
+ assert len(H[4][9]) == 3 if G.is_directed() else 6
+ assert {"value": "d"} in H[4][9].values()
+ assert {"value": "e"} in H[9][4].values()
+ assert {"value": "f"} in H[4][9].values()
+ assert len(H[9][4]) == 3 if G.is_directed() else 6
+
+ def test_relabel_multigraph_merge_inplace(self):
+ G = nx.MultiGraph([(0, 1), (0, 2), (0, 3), (0, 1), (0, 2), (0, 3)])
+ G[0][1][0]["value"] = "a"
+ G[0][2][0]["value"] = "b"
+ G[0][3][0]["value"] = "c"
+ mapping = {1: 4, 2: 4, 3: 4}
+ nx.relabel_nodes(G, mapping, copy=False)
+ # No ordering on keys enforced
+ assert {"value": "a"} in G[0][4].values()
+ assert {"value": "b"} in G[0][4].values()
+ assert {"value": "c"} in G[0][4].values()
+
+ def test_relabel_multidigraph_merge_inplace(self):
+ G = nx.MultiDiGraph([(0, 1), (0, 2), (0, 3)])
+ G[0][1][0]["value"] = "a"
+ G[0][2][0]["value"] = "b"
+ G[0][3][0]["value"] = "c"
+ mapping = {1: 4, 2: 4, 3: 4}
+ nx.relabel_nodes(G, mapping, copy=False)
+ # No ordering on keys enforced
+ assert {"value": "a"} in G[0][4].values()
+ assert {"value": "b"} in G[0][4].values()
+ assert {"value": "c"} in G[0][4].values()
+
+ def test_relabel_multidigraph_inout_copy(self):
+ G = nx.MultiDiGraph([(0, 4), (1, 4), (4, 2), (4, 3)])
+ G[0][4][0]["value"] = "a"
+ G[1][4][0]["value"] = "b"
+ G[4][2][0]["value"] = "c"
+ G[4][3][0]["value"] = "d"
+ G.add_edge(0, 4, key="x", value="e")
+ G.add_edge(4, 3, key="x", value="f")
+ mapping = {0: 9, 1: 9, 2: 9, 3: 9}
+ H = nx.relabel_nodes(G, mapping, copy=True)
+ # No ordering on keys enforced
+ assert {"value": "a"} in H[9][4].values()
+ assert {"value": "b"} in H[9][4].values()
+ assert {"value": "c"} in H[4][9].values()
+ assert len(H[4][9]) == 3
+ assert {"value": "d"} in H[4][9].values()
+ assert {"value": "e"} in H[9][4].values()
+ assert {"value": "f"} in H[4][9].values()
+ assert len(H[9][4]) == 3
+
+ def test_relabel_multigraph_merge_copy(self):
+ G = nx.MultiGraph([(0, 1), (0, 2), (0, 3)])
+ G[0][1][0]["value"] = "a"
+ G[0][2][0]["value"] = "b"
+ G[0][3][0]["value"] = "c"
+ mapping = {1: 4, 2: 4, 3: 4}
+ H = nx.relabel_nodes(G, mapping, copy=True)
+ assert {"value": "a"} in H[0][4].values()
+ assert {"value": "b"} in H[0][4].values()
+ assert {"value": "c"} in H[0][4].values()
+
+ def test_relabel_multidigraph_merge_copy(self):
+ G = nx.MultiDiGraph([(0, 1), (0, 2), (0, 3)])
+ G[0][1][0]["value"] = "a"
+ G[0][2][0]["value"] = "b"
+ G[0][3][0]["value"] = "c"
+ mapping = {1: 4, 2: 4, 3: 4}
+ H = nx.relabel_nodes(G, mapping, copy=True)
+ assert {"value": "a"} in H[0][4].values()
+ assert {"value": "b"} in H[0][4].values()
+ assert {"value": "c"} in H[0][4].values()
+
+ def test_relabel_multigraph_nonnumeric_key(self):
+ for MG in (nx.MultiGraph, nx.MultiDiGraph):
+ for cc in (True, False):
+ G = nx.MultiGraph()
+ G.add_edge(0, 1, key="I", value="a")
+ G.add_edge(0, 2, key="II", value="b")
+ G.add_edge(0, 3, key="II", value="c")
+ mapping = {1: 4, 2: 4, 3: 4}
+ nx.relabel_nodes(G, mapping, copy=False)
+ assert {"value": "a"} in G[0][4].values()
+ assert {"value": "b"} in G[0][4].values()
+ assert {"value": "c"} in G[0][4].values()
+ assert 0 in G[0][4]
+ assert "I" in G[0][4]
+ assert "II" in G[0][4]
+
+ def test_relabel_circular(self):
+ G = nx.path_graph(3)
+ mapping = {0: 1, 1: 0}
+ H = nx.relabel_nodes(G, mapping, copy=True)
+ with pytest.raises(nx.NetworkXUnfeasible):
+ H = nx.relabel_nodes(G, mapping, copy=False)
+
+ def test_relabel_preserve_node_order_full_mapping_with_copy_true(self):
+ G = nx.path_graph(3)
+ original_order = list(G.nodes())
+ mapping = {2: "a", 1: "b", 0: "c"} # dictionary keys out of order on purpose
+ H = nx.relabel_nodes(G, mapping, copy=True)
+ new_order = list(H.nodes())
+ assert [mapping.get(i, i) for i in original_order] == new_order
+
+ def test_relabel_preserve_node_order_full_mapping_with_copy_false(self):
+ G = nx.path_graph(3)
+ original_order = list(G)
+ mapping = {2: "a", 1: "b", 0: "c"} # dictionary keys out of order on purpose
+ H = nx.relabel_nodes(G, mapping, copy=False)
+ new_order = list(H)
+ assert [mapping.get(i, i) for i in original_order] == new_order
+
+ def test_relabel_preserve_node_order_partial_mapping_with_copy_true(self):
+ G = nx.path_graph(3)
+ original_order = list(G)
+ mapping = {1: "a", 0: "b"} # partial mapping and keys out of order on purpose
+ H = nx.relabel_nodes(G, mapping, copy=True)
+ new_order = list(H)
+ assert [mapping.get(i, i) for i in original_order] == new_order
+
+ def test_relabel_preserve_node_order_partial_mapping_with_copy_false(self):
+ G = nx.path_graph(3)
+ original_order = list(G)
+ mapping = {1: "a", 0: "b"} # partial mapping and keys out of order on purpose
+ H = nx.relabel_nodes(G, mapping, copy=False)
+ new_order = list(H)
+ assert [mapping.get(i, i) for i in original_order] != new_order
generated by cgit v1.2.3 (git 2.47.1) at 2025-07-27 08:00:05 +0000