Graph.number_of_edges#
- Graph.number_of_edges(u=None, v=None)[source]#
Returns the number of edges between two nodes.
- Parameters:
- u, vnodes, optional (default=all edges)
If u and v are specified, return the number of edges between u and v. Otherwise return the total number of all edges.
- Returns:
- nedgesint
The number of edges in the graph. If nodes
u
andv
are specified return the number of edges between those nodes. If the graph is directed, this only returns the number of edges fromu
tov
.
See also
Examples
For undirected graphs, this method counts the total number of edges in the graph:
>>> G = nx.path_graph(4) >>> G.number_of_edges() 3
If you specify two nodes, this counts the total number of edges joining the two nodes:
>>> G.number_of_edges(0, 1) 1
For directed graphs, this method can count the total number of directed edges from
u
tov
:>>> G = nx.DiGraph() >>> G.add_edge(0, 1) >>> G.add_edge(1, 0) >>> G.number_of_edges(0, 1) 1