

def node_link_data(G, attrs=None):
    "Return data in node-link format that is suitable for JSON serialization\n    and use in Javascript documents.\n\n    Parameters\n    ----------\n    G : NetworkX graph\n\n    attrs : dict\n        A dictionary that contains five keys 'source', 'target', 'name',\n        'key' and 'link'.  The corresponding values provide the attribute\n        names for storing NetworkX-internal graph data.  The values should\n        be unique.  Default value::\n\n            dict(source='source', target='target', name='name',\n                 key='key', link='links')\n\n        If some user-defined graph data use these attribute names as data keys,\n        they may be silently dropped.\n\n    Returns\n    -------\n    data : dict\n       A dictionary with node-link formatted data.\n\n    Raises\n    ------\n    NetworkXError\n        If values in attrs are not unique.\n\n    Examples\n    --------\n    >>> from networkx.readwrite import json_graph\n    >>> G = nx.Graph([('A', 'B')])\n    >>> data1 = json_graph.node_link_data(G)\n    >>> H = nx.gn_graph(2)\n    >>> data2 = json_graph.node_link_data(H, {'link': 'edges', 'source': 'from', 'target': 'to'})    \n\n    To serialize with json\n\n    >>> import json\n    >>> s1 = json.dumps(data1)\n    >>> s2 = json.dumps(data2, {'link': 'edges', 'source': 'from', 'target': 'to'})\n\n    Notes\n    -----\n    Graph, node, and link attributes are stored in this format.  Note that\n    attribute keys will be converted to strings in order to comply with JSON.\n\n    Attribute 'key' is only used for multigraphs.\n\n    See Also\n    --------\n    node_link_graph, adjacency_data, tree_data\n    "
    multigraph = u.is_multigraph()
    if (attrs is None):
        attrs = _attrs
    else:
        attrs.update({k: v for (k, v) in _attrs.items() if (k not in attrs)})
    name = attrs['name']
    source = attrs['source']
    target = attrs['target']
    links = attrs['link']
    key = (None if (not multigraph) else attrs['key'])
    if (len(set([source, target, key])) < 3):
        raise nx.NetworkXError('Attribute names are not unique.')
    mapping = dict(zip(G, count()))
    data = {
        
    }
    data['directed'] = G.is_directed()
    data['multigraph'] = multigraph
    data['graph'] = G.graph
    data['nodes'] = [dict(chain(G.node[n].items(), [(name, n)])) for n in G]
    if multigraph:
        data[links] = [dict(chain(d.items(), [(source, mapping[u]), (target, mapping[v]), (key, k)])) for (u, v, k, d) in G.edges(keys=True, data=True)]
    else:
        data[links] = [dict(chain(d.items(), [(source, mapping[u]), (target, mapping[v])])) for (u, v, d) in G.edges(data=True)]
    return data

dataset/ETHPy150Open networkx/networkx/networkx/readwrite/json_graph/node_link.py node_link_data/VarMisuse@18/651 `G`->`u`