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This documents an unmaintained version of NetworkX. Please upgrade to a maintained version and see the current NetworkX documentation.

networkx.algorithms.traversal.breadth_first_search.bfs_tree

bfs_tree(G, source, reverse=False)[source]

Return an oriented tree constructed from of a breadth-first-search starting at source.

Parameters:
  • G (NetworkX graph)
  • source (node) – Specify starting node for breadth-first search and return edges in the component reachable from source.
  • reverse (bool, optional) – If True traverse a directed graph in the reverse direction
Returns:

T – An oriented tree

Return type:

NetworkX DiGraph

Examples

>>> G = nx.path_graph(3)
>>> print(list(nx.bfs_tree(G,1).edges()))
[(1, 0), (1, 2)]

Notes

Based on http://www.ics.uci.edu/~eppstein/PADS/BFS.py by D. Eppstein, July 2004.