我更新了 matplotlib 到当前版本后，在 networkX 中遇到了一个节点标签的问题：如果我使用 nx.draw(G) 命令，我可以得到一张图，但是没有标签显示。让我们通过例子来说明：
import networkx as nx
import matplotlib.pylab as plt
T=nx.Graph()
T.add_edge(0,1)
nx.draw(T)
plt.show()
这将返回一个有效的图，但没有节点标签。即使我直接传递标签，例如：
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()
还没有标签。我很确定在更新之前（特别是上面的那个）它是可以正常工作的。那么，从 matplotlib 1.3.x（不记得之前运行的确切版本号了）到现在是否有任何更改？当前的版本为：
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
如果我使用
nx.draw(T, with_labels=True)运行上面的代码，我会得到一个图表（在我的设置中额外的窗口），当我关闭它时，会出现一个TypeError: bad argument type for built-in operation。如果我运行nx.draw(T, with_labels=False)，就不会发生这种情况，这非常令人困惑，因为我认为with_labels参数接受一个布尔值（请参见此处），但它（部分）不是这样的……？我是否有什么误解？
编辑：@tcaswell 希望这可以帮助！
---------------------------------------------------------------------------
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，请耐心等待！
TypeError的完整堆栈跟踪吗？ - tacaswellmatplotlib==1.4.0和networkx==1.8.1时，无论标签是否打开，我都会遇到这些错误。更新到networkx==1.9后，只有在一般情况下打开（或使用）标签时才会出现相同的错误。 - Panagiotis