is_weighted

is_weighted(G, edge=None, weight='weight')

Returns True if G has weighted edges.

Parameters:

Ggraph

A NetworkX graph.

edgetuple, optional

A 2-tuple specifying the only edge in G that will be tested. If None, then every edge in G is tested.

weight: string, optional

The attribute name used to query for edge weights.

Returns:

bool

A boolean signifying if G, or the specified edge, is weighted.

Raises:

NetworkXError

If the specified edge does not exist.

Examples

>>> G = nx.path_graph(4)
>>> nx.is_weighted(G)
False
>>> nx.is_weighted(G, (2, 3))
False

>>> G = nx.DiGraph()
>>> G.add_edge(1, 2, weight=1)
>>> nx.is_weighted(G)
True