使用networkx和matplotlib从图形中丢失文本

Question

我已经在 Mac Os 10.10.3 for python 3.3 上使用 pip 安装了 networkx 和 matplotlib。

当我运行以下代码时：

import networkx as nx
import matplotlib.pyplot as plt

def simple_graph():

    #create an empty graph
    G = nx.Graph()

    #add three edges
    G.add_edge('A','B');
    G.add_edge('B','C');
    G.add_edge('C','A');

    #draw the graph
    nx.draw(G)

    #show
    plt.show()

simple_graph()

我得到了预期的图表，但所有文本都丢失了。有什么建议吗？

Answer 1

传递参数with_labels=True:

import networkx as nx
import matplotlib.pyplot as plt

def simple_graph():

    #create an empty graph
    G = nx.Graph()

    #add three edges
    G.add_edge('A','B');
    G.add_edge('B','C');
    G.add_edge('C','A');

    #draw the graph
    nx.draw(G,with_labels=True)

    #show
    plt.show()

simple_graph()

产生情节：

如果你打电话给draw_networkx:

基本上nx.draw 调用nx.draw_networkx，但没有设置某些参数。

Answer 2

主要问题正如 EdChum 所回答的那样。

但是，您似乎正在使用 ipython。在这种情况下，即使包含 with_labels=True 也可能会失败。如果您绘制并保存它，它将具有标签，但不会使用plt.show() 命令显示标签。这是一个错误，（根据 cmets）已在即将发布的版本中修复。

如果我将您的代码编辑为 with_labels=True:

import networkx as nx
import matplotlib.pyplot as plt

def simple_graph():

    #create an empty graph
    G = nx.Graph()

    #add three edges
    G.add_edge('A','B');
    G.add_edge('B','C');
    G.add_edge('C','A');

    #draw the graph
    nx.draw(G, with_labels=True)

    #show
    plt.show()

simple_graph()

并在 ipython 中运行它，我得到了绘图，但没有出现标签，并且错误消息：

>Traceback (most recent call last):
>  File "/Users/xxx/anaconda/lib/python2.7/site-packages/matplotlib/artist.py", >line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/Users/xxx/anaconda/lib/python2.7/site-packages/matplotlib/figure.py", line 1079, in draw
    func(*args)
  File "/Users/xxx/anaconda/lib/python2.7/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/Users/xxx/anaconda/lib/python2.7/site-packages/matplotlib/axes/_base.py", line 2092, in draw
    a.draw(renderer)
  File "/Users/xxx/anaconda/lib/python2.7/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/Users/xxx/anaconda/lib/python2.7/site-packages/matplotlib/text.py", line 538, in draw
    bbox, info, descent = self._get_layout(renderer)
  File "/Users/xxx/anaconda/lib/python2.7/site-packages/matplotlib/text.py", line 311, in _get_layout
    ismath=False)
  File "/Users/xxx/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_macosx.py", line 166, in get_text_width_height_descent
    six.text_type(s), family, size, weight, style)
TypeError: bad argument type for built-in operation

这是一个已知的错误。一些细节可以在这里找到：pylab/networkx; no node labels displayed after update