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# networkx.algorithms.traversal.depth_first_search.dfs_labeled_edges¶

dfs_labeled_edges(G, source=None, depth_limit=None)[source]

Iterate over edges in a depth-first-search (DFS) labeled by type.

Parameters: G (NetworkX graph) source (node, optional) – Specify starting node for depth-first search and return edges in the component reachable from source. depth_limit (int, optional (default=len(G))) – Specify the maximum search depth. edges – A generator of triples of the form (u, v, d), where (u, v) is the edge being explored in the depth-first search and d is one of the strings ‘forward’, ‘nontree’, or ‘reverse’. A ‘forward’ edge is one in which u has been visited but v has not. A ‘nontree’ edge is one in which both u and v have been visited but the edge is not in the DFS tree. A ‘reverse’ edge is on in which both u and v have been visited and the edge is in the DFS tree. generator

Examples

The labels reveal the complete transcript of the depth-first search algorithm in more detail than, for example, dfs_edges():

>>> from pprint import pprint
>>>
>>> G = nx.DiGraph([(0, 1), (1, 2), (2, 1)])
>>> pprint(list(nx.dfs_labeled_edges(G, source=0)))
[(0, 0, 'forward'),
(0, 1, 'forward'),
(1, 2, 'forward'),
(2, 1, 'nontree'),
(1, 2, 'reverse'),
(0, 1, 'reverse'),
(0, 0, 'reverse')]


Notes

If a source is not specified then a source is chosen arbitrarily and repeatedly until all components in the graph are searched.

The implementation of this function is adapted from David Eppstein’s depth-first search function in PADS, with modifications to allow depth limits based on the Wikipedia article “Depth-limited search”.