python - 属性错误: 'NodeView' object has no attribute 'index'

Question

我正在使用 Networkx pyhton 库。

我尝试测试一个定义以下功能的项目:

def _set_up_p0(self, source):
        """ Set up and return the 0th probability vector. """
        p_0 = [0] * self.OG.number_of_nodes()

        for source_id in source:
            try:
                # matrix columns are in the same order as nodes in original nx
                # graph, so we can get the index of the source node from the OG
                source_index = self.OG.nodes().index(source_id)
                p_0[source_index] = 1 / float(len(source))
            except ValueError:
                sys.exit("Source node {} is not in original graph. Source: {}. Exiting.".format(
                          source_id, source))
        return np.array(p_0)

上面的代码生成一个异常:

Traceback (most recent call last):
  File "run_walker.py", line 80, in <module>
    main(sys.argv)
  File "run_walker.py", line 76, in main
    wk.run_exp(seed_list, opts.restart_prob,opts.original_graph_prob, node_list)
  File "./Python_directory/Walker/walker.py", line 57, in run_exp
    p_0 = self._set_up_p0(source)
  File "./Python_directory/Walker/walker.py", line 118, in _set_up_p0
    print(self.OG.nodes().index(source_id))
AttributeError: 'NodeView' object has no attribute 'index'

实际上是以下两行:

print source
print(self.OG.nodes())

我们收到以下错误:

['0', '1']
['1', '0', '3', '2', '4']

因此，当我调用函数 _set_up_p0 时，我得到了上述异常。如果您发现了我的错误在哪里，请

Answer 1

这取决于您使用的networkx版本。更多信息here .

网络x 1.x

>>> G=nx.Graph([(1,2),(3,4)])
>>> G.nodes()
[1, 2, 3, 4]

网络x 2.x

>>> G=nx.Graph([(1,2),(3,4)])
>>> G.nodes()
NodeView((1, 2, 3, 4))

正如您在 networkx2.x 中看到的，您没有列表，只有 NodeView。
您可以使用 list(G.nodes()) 转换为列表。