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- dfs_preorder_nodes(G, source=None)¶
Produce nodes in a depth-first-search pre-ordering starting from source.
G : NetworkX graph
source : node, optional
Specify starting node for depth-first search and return edges in the component reachable from source.
A generator of nodes in a depth-first-search pre-ordering.
Based on http://www.ics.uci.edu/~eppstein/PADS/DFS.py by D. Eppstein, July 2004.
If a source is not specified then a source is chosen arbitrarily and repeatedly until all components in the graph are searched.
>>> G = nx.Graph() >>> G.add_path([0,1,2]) >>> print(list(nx.dfs_preorder_nodes(G,0))) [0, 1, 2]