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我正在尝试使用pylab和networkx 来绘制有向图。

下面是一个小演示脚本及其产生的错误（并且 pylab 创建的窗口是空的）。

谷歌搜索显示这个错误应该在 2008 年已经在 mathplotlib 的 svn 中修复。

任何人都可以指出我正确的方向吗？


这个脚本：

import pylab
import networkx as nx

def Working_with_graphs_using_networkx():
    fig = pylab.figure()
    g = nx.Graph(name = "graph")
    pylab.title(g.name)
    g.add_node("John")
    g.add_node("Maria")
    g.add_edge("John", "Maria")
    pos = nx.spring_layout(g)
    nx.draw(g, pos)

if __name__ == "__main__":
    Working_with_graphs_using_networkx()
    pylab.show()

产生此错误（在 cygwin 下的 Python 2.6 上）：

$ python demo_SeqBase.py
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1410, in __call__
    return self.func(*args)
  File "/usr/lib/python2.6/site-packages/matplotlib/backends/backend_tkagg.py", line 236, in resize
    self.show()
  File "/usr/lib/python2.6/site-packages/matplotlib/backends/backend_tkagg.py", line 239, in draw
    FigureCanvasAgg.draw(self)
  File "/usr/lib/python2.6/site-packages/matplotlib/backends/backend_agg.py", line 401, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/matplotlib/figure.py", line 884, in draw
    func(*args)
  File "/usr/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/matplotlib/axes.py", line 1983, in draw
    a.draw(renderer)
  File "/usr/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/matplotlib/collections.py", line 238, in draw
    self._linewidths, self._linestyles, self._antialiaseds, self._urls)
  File "/usr/lib/python2.6/site-packages/matplotlib/backends/backend_agg.py", line 84, in draw_path_collection
    return self._renderer.draw_path_collection(*kl, **kw)
IndexError: Unexpected SeqBase<T> length.
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