NetworkX / Pandas-无法将节点的度数输出到.txt文件中

Question

我需要将网络节点的程度（以及其他集中度指标）输出到.txt文件中。我可以在以前的 NetworkX / Pandas 版本中做到这一点，但现在出现错误。

我正在使用 NetworkX 版本。2.1和Pandas ver。0.23.4：

import pandas as pd

import networkx as nx

G = nx.Graph()

G.add_edges_from([(1,2),(1,3),(2,3),(3,4),(4,5),(4,6)])

df = pd.DataFrame(dict(

    DEGREE = nx.degree(G),

    DEGREE_CENTRALITY = nx.degree_centrality(G),

    EIGENVECTOR = nx.eigenvector_centrality(G),

    KATZ = nx.katz_centrality_numpy(G),

    CLOSENESS_CENTRALITY = nx.closeness_centrality(G),

    BETWEENNESS_CENTRALITY = nx.betweenness_centrality(G),

    CLUSTCOEF = nx.clustering(G),

)) 

#df.index += 1 

#df.to_csv('centrality-metrics.csv')

错误消息是：

Traceback (most recent call last):

  File "<stdin>", line 8, in <module>

  File "/home/arthur/anaconda2/lib/python2.7/site-packages/pandas/core/frame.py", line 348, in __init__

    mgr = self._init_dict(data, index, columns, dtype=dtype)

  File "/home/arthur/anaconda2/lib/python2.7/site-packages/pandas/core/frame.py", line 459, in _init_dict

    return _arrays_to_mgr(arrays, data_names, index, columns, dtype=dtype)

  File "/home/arthur/anaconda2/lib/python2.7/site-packages/pandas/core/frame.py", line 7356, in _arrays_to_mgr

    index = extract_index(arrays)

  File "/home/arthur/anaconda2/lib/python2.7/site-packages/pandas/core/frame.py", line 7405, in extract_index

    raise ValueError('Mixing dicts with non-Series may lead to '

ValueError: Mixing dicts with non-Series may lead to ambiguous ordering.