networkx.readwrite.adjlist.parse_adjlist¶

parse_adjlist(lines, comments='#', delimiter=None, create_using=None, nodetype=None)[source]¶

Parse lines of a graph adjacency list representation.

Parameters

lines (list or iterator of strings) – Input data in adjlist format
create_using (NetworkX graph constructor, optional (default=nx.Graph)) – Graph type to create. If graph instance, then cleared before populated.
nodetype (Python type, optional) – Convert nodes to this type.
comments (string, optional) – Marker for comment lines
delimiter (string, optional) – Separator for node labels. The default is whitespace.

Returns

G – The graph corresponding to the lines in adjacency list format.

Return type

NetworkX graph

Examples

>>> lines = ["1 2 5", "2 3 4", "3 5", "4", "5"]
>>> G = nx.parse_adjlist(lines, nodetype=int)
>>> nodes = [1, 2, 3, 4, 5]
>>> all(node in G for node in nodes)
True
>>> edges = [(1, 2), (1, 5), (2, 3), (2, 4), (3, 5)]
>>> all((u, v) in G.edges() or (v, u) in G.edges() for (u, v) in edges)
True