def has_edge(self, u, v):
        """Return True if the edge (u,v) is in the graph.

        Parameters
        ----------
        u,v : nodes
            Nodes can be, for example, strings or numbers.
            Nodes must be hashable (and not None) Python objects.

        Returns
        -------
        edge_ind : bool
            True if edge is in the graph, False otherwise.

        Examples
        --------
        Can be called either using two nodes u,v or edge tuple (u,v)

        >>> G = nx.Graph()   # or DiGraph, MultiGraph, MultiDiGraph, etc
        >>> G.add_path([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
        >>> e = (0,1,{'weight':7})
        >>> G.has_edge(*e[:2])  # e is a 3-tuple (u,v,data_dictionary)
        True

        The following syntax are all equivalent:

        >>> G.has_edge(0,1)
        True
        >>> 1 in G[0]  # though this gives KeyError if 0 not in G
        True

        """
        try:
            return v in self.adj[u]
        except __HOLE__:
            return False
dataset/ETHPy150Open gkno/gkno_launcher/src/networkx/classes/graph.py/Graph.has_edge