generate_adjlist

generate_adjlist(G, delimiter=' ')

Generate lines representing a graph in adjacency list format.

Parameters:

GNetworkX graph

delimiterstr, default=” “

Separator for node labels.

Yields:

str

Adjacency list for a node in G. The first item is the node label, followed by the labels of its neighbors.

See also

write_adjlist, read_adjlist

Notes

The default delimiter=" " will result in unexpected results if node names contain whitespace characters. To avoid this problem, specify an alternate delimiter when spaces are valid in node names.

NB: This option is not available for data that isn’t user-generated.

Examples

>>> G = nx.lollipop_graph(4, 3)
>>> for line in nx.generate_adjlist(G):
...     print(line)
0 1 2 3
1 2 3
2 3
3 4
4 5
5 6
6

When G is undirected, each edge is only listed once. For directed graphs, edges appear once for each direction.

>>> G = nx.complete_graph(3, create_using=nx.DiGraph)
>>> for line in nx.generate_adjlist(G):
...     print(line)
0 1 2
1 0 2
2 0 1

Node labels are shown multiple times for multiedges, but edge data (including keys) are not included in the output.

>>> G = nx.MultiGraph([(0, 1, {"weight": 1}), (0, 1, {"weight": 2})])
>>> for line in nx.generate_adjlist(G):
...     print(line)
0 1 1
1