is_branching

is_branching(G)

Returns True if G is a branching.

A branching is a directed forest with maximum in-degree equal to 1.

Parameters:

Gdirected graph

The directed graph to test.

Returns:

bbool

A boolean that is True if G is a branching.

See also

is_forest

Notes

In another convention, a branching is also known as a forest.

Examples

>>> G = nx.DiGraph([(0, 1), (1, 2), (2, 3), (3, 4)])
>>> nx.is_branching(G)
True
>>> G.remove_edge(2, 3)
>>> G.add_edge(3, 1)  # maximum in-degree is 2
>>> nx.is_branching(G)
False