is_directed_acyclic_graph

is_directed_acyclic_graph(G)

Returns True if the graph G is a directed acyclic graph (DAG) or False if not.

Parameters:

GNetworkX graph

Returns:

bool

True if G is a DAG, False otherwise

See also

topological_sort

Examples

Undirected graph:

>>> G = nx.Graph([(1, 2), (2, 3)])
>>> nx.is_directed_acyclic_graph(G)
False

Directed graph with cycle:

>>> G = nx.DiGraph([(1, 2), (2, 3), (3, 1)])
>>> nx.is_directed_acyclic_graph(G)
False

Directed acyclic graph:

>>> G = nx.DiGraph([(1, 2), (2, 3)])
>>> nx.is_directed_acyclic_graph(G)
True