selfloop_edges

MultiGraph.selfloop_edges(data=False, keys=False)

Return a list of selfloop edges.

A selfloop edge has the same node at both ends.

Parameters :

data : bool, optional (default=False)

Return selfloop edges as two tuples (u,v) (data=False) or three-tuples (u,v,data) (data=True)

keys : bool, optional (default=False)

If True, return edge keys with each edge.

Returns :

edgelist : list of edge tuples

A list of all selfloop edges.

See also

nodes_with_selfloops, number_of_selfloops

Examples

>>> G = nx.MultiGraph()   # or MultiDiGraph
>>> G.add_edge(1,1)
>>> G.add_edge(1,2)
>>> G.selfloop_edges()
[(1, 1)]
>>> G.selfloop_edges(data=True)
[(1, 1, {})]
>>> G.selfloop_edges(keys=True)
[(1, 1, 0)]
>>> G.selfloop_edges(keys=True, data=True)
[(1, 1, 0, {})]