def add_nodes_from(self, nodes, **attr):
        """Add multiple nodes.

        Parameters
        ----------
        nodes : iterable container
            A container of nodes (list, dict, set, etc.).
            OR
            A container of (node, attribute dict) tuples.
            Node attributes are updated using the attribute dict.
        attr : keyword arguments, optional (default= no attributes)
            Update attributes for all nodes in nodes.
            Node attributes specified in nodes as a tuple
            take precedence over attributes specified generally.

        See Also
        --------
        add_node

        Examples
        --------
        >>> G = nx.Graph()   # or DiGraph, MultiGraph, MultiDiGraph, etc
        >>> G.add_nodes_from('Hello')
        >>> K3 = nx.Graph([(0,1),(1,2),(2,0)])
        >>> G.add_nodes_from(K3)
        >>> sorted(G.nodes(),key=str)
        [0, 1, 2, 'H', 'e', 'l', 'o']

        Use keywords to update specific node attributes for every node.

        >>> G.add_nodes_from([1,2], size=10)
        >>> G.add_nodes_from([3,4], weight=0.4)

        Use (node, attrdict) tuples to update attributes for specific
        nodes.

        >>> G.add_nodes_from([(1,dict(size=11)), (2,{'color':'blue'})])
        >>> G.node[1]['size']
        11
        >>> H = nx.Graph()
        >>> H.add_nodes_from(G.nodes(data=True))
        >>> H.node[1]['size']
        11

        """
        for n in nodes:
            try:
                if n not in self.succ:
                    self.succ[n] = {}
                    self.pred[n] = {}
                    self.node[n] = attr.copy()
                else:
                    self.node[n].update(attr)
            except TypeError:
                nn,ndict = n
                if nn is not self.succ:
                    self.succ[nn] = {}
                    self.pred[nn] = {}
                    newdict = attr.copy()
                    newdict.update(ndict)
                    self.node[nn] = newdict
                else:
                    olddict = self.node[nn]
                    olddict.update(attr)
                    olddict.update(ndict)
dataset/ETHPy150Open networkx/networkx/networkx/classes/tests/timingclasses.py/TimingDiGraph.add_nodes_from/operator `not in` -> `is not`