在networkx中添加边属性

Question

我想在networkx中给边添加标签。我打算用 nx.write_dot() 把它转换成一个dot文件。请问我该怎么做呢？当我这样做时：G.add_edge("ATC", "TCG", label = "ATCG")，nx.write_dot() 就报错了。我很喜欢networkx，但如果它不能给边加标签，那我可能就得换个库了。

具体来说，我遇到了这个错误：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.3/site-packages/networkx/drawing/nx_agraph.py", line 180, in write_dot
    A.clear()
  File "/usr/local/lib/python3.3/site-packages/pygraphviz/agraph.py", line 907, in clear
    self.edge_attr.clear()
  File "/usr/local/Cellar/python3/3.3.3/Frameworks/Python.framework/Versions/3.3/lib/python3.3/collections/abc.py", line 553, in clear
    self.popitem()
  File "/usr/local/Cellar/python3/3.3.3/Frameworks/Python.framework/Versions/3.3/lib/python3.3/collections/abc.py", line 542, in popitem
    key = next(iter(self))
  File "/usr/local/lib/python3.3/site-packages/pygraphviz/agraph.py", line 1692, in __iter__
    for (k,v) in self.iteritems():
  File "/usr/local/lib/python3.3/site-packages/pygraphviz/agraph.py", line 1700, in iteritems
    yield (gv.agattrname(ah).decode(self.encoding),
AttributeError: 'str' object has no attribute 'decode'

Answer 1

应该像这样工作：

In [1]: import networkx as nx

In [2]: G = nx.Graph()

In [3]: G.add_edge(1,2,label='one-two')

In [4]: import sys

In [5]: nx.write_dot(G,sys.stdout)
strict graph  {
    1 -- 2   [label="one-two"];
}