pylab/networkx; 更新后没有显示节点标签

Question

在我将matplotlib更新到当前版本后,我遇到了networkX中的节点标签问题:如果我使用该nx.draw(G)命令,我会得到一个图表,但不会显示任何标签.但让我们举个例子说:

import networkx as nx
import matplotlib.pylab as plt

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

这将返回一个有效的图,但没有节点标签.即使我直接传递标签

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(特别是上面的)在更新之前昨天正在工作.那么matplotlib 1.3.x是否有变化(不记得我之前运行的那个)？目前的版本是:

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

Little Extra:如果我运行上面的代码,nx.draw(T, with_labels=True)我得到一个情节(我的设置上的额外窗口),当我关闭它时TypeError: bad argument type for built-in operation弹出一个.如果我跑nx.draw(T, with_labels=False),这不会发生,这是非常令人困惑的,因为我认为with_labels参数采用布尔值(见这里),它(部分)不....

我在这里误解了什么吗？

编辑:@tcaswell希望有所帮助!

---------------------------------------------------------------------------
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,但愿意学习,所以请耐心等待!)

Answer 1

这是 OSX 后端中一个已知（但未解决）的错误 ( #3470 )。

切换到基于 Agg 的后端之一应该可以通过避免问题来“解决”该问题。

更新

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