'Remove the edge between u and v.
Parameters
u, v : nodes
Remove the edge between nodes u and v.
Raises
NetworkXError
If there is not an edge between u and v.
See Also
remove_edges_from : remove a collection of edges
Examples
>>> G = nx.path_graph(4)  # or DiGraph, etc
>>> G.remove_edge(0, 1)
>>> e = (1, 2)
>>> G.remove_edge(*e) # unpacks e from an edge tuple
>>> e = (2, 3, {\'weight\':7}) # an edge with attribute data
>>> G.remove_edge(*e[:2]) # select first part of edge tuple'

def remove_edge(self, u, v):

    try:
        del self._adj[u][v]
        if (u != v):
            del self._adj[v][u]
    except KeyError:
        raise NetworkXError(('The    edge    %s-%s    is    not    in    the    graph' % (u, v)))
