We have made some API changes, detailed below, to add clarity. This page reflects changes from networkx-1.3 to networkx-1.4. For changes from earlier versions to networkx-1.0 see Version 1.0 API changes.
Please send comments and questions to the networkx-discuss mailing list: http://groups.google.com/group/networkx-discuss .
These algorithms now raise an exception when a source and a target are specified and no path exist between these two nodes. The exception is a NetworkXNoPath exception.