networkx.classes.is_weighted¶

networkx.classes.is_weighted(G, edge=None, weight='weight')[source]¶

Returns True if G has weighted edges.

Parameters:	G : graph A NetworkX graph. edge : tuple, 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