networkx.MultiDiGraph.has_edge¶
-
MultiDiGraph.
has_edge
(u, v, key=None)¶ Returns True if the graph has an edge between nodes u and v.
This is the same as
v in G[u] or key in G[u][v]
without KeyError exceptions.- Parameters
u, v (nodes) – Nodes can be, for example, strings or numbers.
key (hashable identifier, optional (default=None)) – If specified return True only if the edge with key is found.
- Returns
edge_ind – True if edge is in the graph, False otherwise.
- Return type
Examples
Can be called either using two nodes u, v, an edge tuple (u, v), or an edge tuple (u, v, key).
>>> G = nx.MultiGraph() # or MultiDiGraph >>> nx.add_path(G, [0, 1, 2, 3]) >>> G.has_edge(0, 1) # using two nodes True >>> e = (0, 1) >>> G.has_edge(*e) # e is a 2-tuple (u, v) True >>> G.add_edge(0, 1, key="a") 'a' >>> G.has_edge(0, 1, key="a") # specify key True >>> e = (0, 1, "a") >>> G.has_edge(*e) # e is a 3-tuple (u, v, 'a') True
The following syntax are equivalent:
>>> G.has_edge(0, 1) True >>> 1 in G[0] # though this gives :exc:`KeyError` if 0 not in G True