""" Unit tests for edgelists. """ import pytest import io import tempfile import os import networkx as nx from networkx.testing import (assert_edges_equal, assert_nodes_equal, assert_graphs_equal) class TestEdgelist: @classmethod def setup_class(cls): cls.G = nx.Graph(name="test") e = [('a', 'b'), ('b', 'c'), ('c', 'd'), ('d', 'e'), ('e', 'f'), ('a', 'f')] cls.G.add_edges_from(e) cls.G.add_node('g') cls.DG = nx.DiGraph(cls.G) cls.XG = nx.MultiGraph() cls.XG.add_weighted_edges_from([(1, 2, 5), (1, 2, 5), (1, 2, 1), (3, 3, 42)]) cls.XDG = nx.MultiDiGraph(cls.XG) def test_read_edgelist_1(self): s = b"""\ # comment line 1 2 # comment line 2 3 """ bytesIO = io.BytesIO(s) G = nx.read_edgelist(bytesIO, nodetype=int) assert_edges_equal(G.edges(), [(1, 2), (2, 3)]) def test_read_edgelist_2(self): s = b"""\ # comment line 1 2 2.0 # comment line 2 3 3.0 """ bytesIO = io.BytesIO(s) G = nx.read_edgelist(bytesIO, nodetype=int, data=False) assert_edges_equal(G.edges(), [(1, 2), (2, 3)]) bytesIO = io.BytesIO(s) G = nx.read_weighted_edgelist(bytesIO, nodetype=int) assert_edges_equal(G.edges(data=True), [(1, 2, {'weight': 2.0}), (2, 3, {'weight': 3.0})]) def test_read_edgelist_3(self): s = b"""\ # comment line 1 2 {'weight':2.0} # comment line 2 3 {'weight':3.0} """ bytesIO = io.BytesIO(s) G = nx.read_edgelist(bytesIO, nodetype=int, data=False) assert_edges_equal(G.edges(), [(1, 2), (2, 3)]) bytesIO = io.BytesIO(s) G = nx.read_edgelist(bytesIO, nodetype=int, data=True) assert_edges_equal(G.edges(data=True), [(1, 2, {'weight': 2.0}), (2, 3, {'weight': 3.0})]) def test_read_edgelist_4(self): s = b"""\ # comment line 1 2 {'weight':2.0} # comment line 2 3 {'weight':3.0} """ bytesIO = io.BytesIO(s) G = nx.read_edgelist(bytesIO, nodetype=int, data=False) assert_edges_equal(G.edges(), [(1, 2), (2, 3)]) bytesIO = io.BytesIO(s) G = nx.read_edgelist(bytesIO, nodetype=int, data=True) assert_edges_equal(G.edges(data=True), [(1, 2, {'weight': 2.0}), (2, 3, {'weight': 3.0})]) s = """\ # comment line 1 2 {'weight':2.0} # comment line 2 3 {'weight':3.0} """ StringIO = io.StringIO(s) G = nx.read_edgelist(StringIO, nodetype=int, data=False) assert_edges_equal(G.edges(), [(1, 2), (2, 3)]) StringIO = io.StringIO(s) G = nx.read_edgelist(StringIO, nodetype=int, data=True) assert_edges_equal(G.edges(data=True), [(1, 2, {'weight': 2.0}), (2, 3, {'weight': 3.0})]) def test_write_edgelist_1(self): fh = io.BytesIO() G = nx.OrderedGraph() G.add_edges_from([(1, 2), (2, 3)]) nx.write_edgelist(G, fh, data=False) fh.seek(0) assert fh.read() == b"1 2\n2 3\n" def test_write_edgelist_2(self): fh = io.BytesIO() G = nx.OrderedGraph() G.add_edges_from([(1, 2), (2, 3)]) nx.write_edgelist(G, fh, data=True) fh.seek(0) assert fh.read() == b"1 2 {}\n2 3 {}\n" def test_write_edgelist_3(self): fh = io.BytesIO() G = nx.OrderedGraph() G.add_edge(1, 2, weight=2.0) G.add_edge(2, 3, weight=3.0) nx.write_edgelist(G, fh, data=True) fh.seek(0) assert fh.read() == b"1 2 {'weight': 2.0}\n2 3 {'weight': 3.0}\n" def test_write_edgelist_4(self): fh = io.BytesIO() G = nx.OrderedGraph() G.add_edge(1, 2, weight=2.0) G.add_edge(2, 3, weight=3.0) nx.write_edgelist(G, fh, data=[('weight')]) fh.seek(0) assert fh.read() == b"1 2 2.0\n2 3 3.0\n" def test_unicode(self): G = nx.Graph() try: # Python 3.x name1 = chr(2344) + chr(123) + chr(6543) name2 = chr(5543) + chr(1543) + chr(324) except ValueError: # Python 2.6+ name1 = unichr(2344) + unichr(123) + unichr(6543) name2 = unichr(5543) + unichr(1543) + unichr(324) G.add_edge(name1, 'Radiohead', **{name2: 3}) fd, fname = tempfile.mkstemp() nx.write_edgelist(G, fname) H = nx.read_edgelist(fname) assert_graphs_equal(G, H) os.close(fd) os.unlink(fname) def test_latin1_issue(self): G = nx.Graph() try: # Python 3.x name1 = chr(2344) + chr(123) + chr(6543) name2 = chr(5543) + chr(1543) + chr(324) except ValueError: # Python 2.6+ name1 = unichr(2344) + unichr(123) + unichr(6543) name2 = unichr(5543) + unichr(1543) + unichr(324) G.add_edge(name1, 'Radiohead', **{name2: 3}) fd, fname = tempfile.mkstemp() pytest.raises(UnicodeEncodeError, nx.write_edgelist, G, fname, encoding='latin-1') os.close(fd) os.unlink(fname) def test_latin1(self): G = nx.Graph() try: # Python 3.x blurb = chr(1245) # just to trigger the exception name1 = 'Bj' + chr(246) + 'rk' name2 = chr(220) + 'ber' except ValueError: # Python 2.6+ name1 = 'Bj' + unichr(246) + 'rk' name2 = unichr(220) + 'ber' G.add_edge(name1, 'Radiohead', **{name2: 3}) fd, fname = tempfile.mkstemp() nx.write_edgelist(G, fname, encoding='latin-1') H = nx.read_edgelist(fname, encoding='latin-1') assert_graphs_equal(G, H) os.close(fd) os.unlink(fname) def test_edgelist_graph(self): G = self.G (fd, fname) = tempfile.mkstemp() nx.write_edgelist(G, fname) H = nx.read_edgelist(fname) H2 = nx.read_edgelist(fname) assert H != H2 # they should be different graphs G.remove_node('g') # isolated nodes are not written in edgelist assert_nodes_equal(list(H), list(G)) assert_edges_equal(list(H.edges()), list(G.edges())) os.close(fd) os.unlink(fname) def test_edgelist_digraph(self): G = self.DG (fd, fname) = tempfile.mkstemp() nx.write_edgelist(G, fname) H = nx.read_edgelist(fname, create_using=nx.DiGraph()) H2 = nx.read_edgelist(fname, create_using=nx.DiGraph()) assert H != H2 # they should be different graphs G.remove_node('g') # isolated nodes are not written in edgelist assert_nodes_equal(list(H), list(G)) assert_edges_equal(list(H.edges()), list(G.edges())) os.close(fd) os.unlink(fname) def test_edgelist_integers(self): G = nx.convert_node_labels_to_integers(self.G) (fd, fname) = tempfile.mkstemp() nx.write_edgelist(G, fname) H = nx.read_edgelist(fname, nodetype=int) # isolated nodes are not written in edgelist G.remove_nodes_from(list(nx.isolates(G))) assert_nodes_equal(list(H), list(G)) assert_edges_equal(list(H.edges()), list(G.edges())) os.close(fd) os.unlink(fname) def test_edgelist_multigraph(self): G = self.XG (fd, fname) = tempfile.mkstemp() nx.write_edgelist(G, fname) H = nx.read_edgelist(fname, nodetype=int, create_using=nx.MultiGraph()) H2 = nx.read_edgelist(fname, nodetype=int, create_using=nx.MultiGraph()) assert H != H2 # they should be different graphs assert_nodes_equal(list(H), list(G)) assert_edges_equal(list(H.edges()), list(G.edges())) os.close(fd) os.unlink(fname) def test_edgelist_multidigraph(self): G = self.XDG (fd, fname) = tempfile.mkstemp() nx.write_edgelist(G, fname) H = nx.read_edgelist(fname, nodetype=int, create_using=nx.MultiDiGraph()) H2 = nx.read_edgelist(fname, nodetype=int, create_using=nx.MultiDiGraph()) assert H != H2 # they should be different graphs assert_nodes_equal(list(H), list(G)) assert_edges_equal(list(H.edges()), list(G.edges())) os.close(fd) os.unlink(fname)