pylab / networkx; 更新后未显示任何节点标签

Question

将matplotlib更新到当前版本后，在networkX中遇到节点标签问题：如果使用该nx.draw(G)命令，将得到一个图形，但未显示任何标签。但是，让我们用示例进行说明：

import networkx as nx
import matplotlib.pylab as plt

T=nx.Graph()
T.add_edge(0,1)
nx.draw(T)
plt.show()

这将返回有效图，但没有节点标签。即使我像这样直接传递标签

import networkx as nx
import matplotlib.pylab as plt

T=nx.Graph()
T.add_edge(0,1)
labs={}
labs[0]='cake'
labs[1]='cookie'
nx.draw(T,labels=labs)
plt.show()

仍然没有标签。我很确定它（尤其是上层）在更新之前已在昨天运行。那么matplotlib 1.3.x是否有变化（不记得我之前运行的确切版本）？当前版本是：

matplotlib (1.4.0)   (had to downgrade the pyparsing to 1.5.7 after updating the matplotlib)
networkx (1.9)
python 2.7.6
Mac OS X 10.9.4

小小额外功能：如果我运行上面的代码，nx.draw(T, with_labels=True)会得到一个图（设置中的额外窗口），当我关闭它时，会TypeError: bad argument type for built-in operation弹出一个窗口。如果我运行nx.draw(T, with_labels=False)，它不会发生，这非常令人困惑，因为我认为with_labels参数需要一个布尔值（请参阅此处），（部分地）它不会....？

我在这里误会什么吗？

编辑：@tcaswell希望有帮助！

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/usr/local/lib/python2.7/site-packages/matplotlib/artist.pyc in draw_wrapper(artist, renderer, *args, **kwargs)
     57     def draw_wrapper(artist, renderer, *args, **kwargs):
     58         before(artist, renderer)
---> 59         draw(artist, renderer, *args, **kwargs)
     60         after(artist, renderer)
     61

/usr/local/lib/python2.7/site-packages/matplotlib/figure.pyc in draw(self, renderer)
   1077         dsu.sort(key=itemgetter(0))
   1078         for zorder, a, func, args in dsu:
-> 1079             func(*args)
   1080 
   1081         renderer.close_group('figure')

/usr/local/lib/python2.7/site-packages/matplotlib/artist.pyc in draw_wrapper(artist, renderer, *args, **kwargs)
     57     def draw_wrapper(artist, renderer, *args, **kwargs):
     58         before(artist, renderer)
---> 59         draw(artist, renderer, *args, **kwargs)
     60         after(artist, renderer)
     61

/usr/local/lib/python2.7/site-packages/matplotlib/axes/_base.pyc in draw(self, renderer, inframe)
   2090 
   2091         for zorder, a in dsu:
-> 2092             a.draw(renderer)
   2093 
   2094         renderer.close_group('axes')

/usr/local/lib/python2.7/site-packages/matplotlib/artist.pyc in draw_wrapper(artist, renderer, *args, **kwargs)
     57     def draw_wrapper(artist, renderer, *args, **kwargs):
     58         before(artist, renderer)
---> 59         draw(artist, renderer, *args, **kwargs)
     60         after(artist, renderer)
     61

/usr/local/lib/python2.7/site-packages/matplotlib/text.pyc in draw(self, renderer)
    536         renderer.open_group('text', self.get_gid())
    537 
--> 538         bbox, info, descent = self._get_layout(renderer)
    539         trans = self.get_transform()
    540

/usr/local/lib/python2.7/site-packages/matplotlib/text.pyc in _get_layout(self, renderer)
    309         tmp, lp_h, lp_bl = renderer.get_text_width_height_descent('lp',
    310                                                          self._fontproperties,
--> 311                                                          ismath=False)
    312         offsety = (lp_h - lp_bl) * self._linespacing
    313

/usr/local/lib/python2.7/site-packages/matplotlib/backends/backend_macosx.pyc in get_text_width_height_descent(self, s, prop, ismath)
    164         size = self.points_to_pixels(points)
    165         width, height, descent = self.gc.get_text_width_height_descent(
--> 166             six.text_type(s), family, size, weight, style)
    167         return  width, height, 0.0*descent
    168

TypeError: bad argument type for built-in operation

（我既不是数学家也不是程序员，但是我愿意学习，所以请耐心等待！）

Answer 1

这正在OSX后端（＃3470）中遇到一个已知的（但尚未解决的）错误。

切换到基于Agg的后端之一应该通过避免它来“解决”问题。

更新

部分问题已被识别并合并https://github.com/matplotlib/matplotlib/pull/3564。此修复程序应该在mpl
v1.4.1及更高版本中。