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

dfs_preorder_nodes
(G, source=None)[source]¶ Produce nodes in a depthfirstsearch preordering starting from source.
Parameters: G : NetworkX graph
source : node, optional
Specify starting node for depthfirst search and return edges in the component reachable from source.
Returns: nodes: generator
A generator of nodes in a depthfirstsearch preordering.
Notes
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.
Examples
>>> G = nx.Graph() >>> G.add_path([0,1,2]) >>> print(list(nx.dfs_preorder_nodes(G,0))) [0, 1, 2]