7.2.1.5. get_unused_node_id

get_unused_node_id(graph, initial_guess='unknown', _format='{}<%d>')

Finds an unused node id in graph.

Parameters:

• graph (networkx.classes.digraph.DiGraph) – A directed graph.
• initial_guess (str, optional) – Initial node id guess.
• _format (str, optional) – Format to generate the new node id if the given is already used.

Returns:

An unused node id.

Return type:

str