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Note

This documents the development version of NetworkX. Documentation for the current release can be found here.

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networkx.algorithms.components.strongly_connected_components¶

strongly_connected_components(G)[source]¶

Generate nodes in strongly connected components of graph.

Parameters: G (NetworkX Graph) – A directed graph.
Returns: comp – A generator of sets of nodes, one for each strongly connected component of G.
Return type: generator of sets
Raises: NetworkXNotImplemented – If G is undirected.

Examples

Generate a sorted list of strongly connected components, largest first.

>>> G = nx.cycle_graph(4, create_using=nx.DiGraph())
>>> nx.add_cycle(G, [10, 11, 12])
>>> [
...     len(c)
...     for c in sorted(nx.strongly_connected_components(G), key=len, reverse=True)
... ]
[4, 3]

If you only want the largest component, it’s more efficient to use max instead of sort.

>>> largest = max(nx.strongly_connected_components(G), key=len)