networkx.Graph.number_of_edges

Graph.number_of_edges(u=None, v=None)

Return the number of edges between two nodes.

Parameters:

u,v : nodes, 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:

nedges : int

The number of edges in the graph. If nodes u and v are specified return the number of edges between those nodes.

See also

size

Examples

>>> G = nx.Graph()   # or DiGraph, MultiGraph, MultiDiGraph, etc
>>> G.add_path([0,1,2,3])
>>> G.number_of_edges()
3
>>> G.number_of_edges(0,1) 
1
>>> e = (0,1)
>>> G.number_of_edges(*e)
1