Question

我一直试图让Pygraphviz在Mac上使用Python3，我无法解决TypeError。

具体来说，以下代码的输出（Python3 / Eclipse Neon / macOS 10.10.5，来自here的改编教程）

import networkx as nx
import queueing_tool as qt
import pygraphviz as pgv

a = pgv.AGraph()
print(a._get_prog('fdp'))

g = qt.generate_random_graph(200, seed=3)
q = qt.QueueNetwork(g, seed=3)
q.max_agents = 20000
q.initialize(100)
q.simulate(10000)

pos = nx.nx_agraph.graphviz_layout(g.to_undirected(), prog='neato')

是以下错误：

/usr/local/bin/fdp //<-- this shows that Eclipse finds 'fdp' after adding /usr/local/bin to $PATH, ERROR in the following:
Traceback (most recent call last):
  File "/Users/flurin/Documents/workspace/pedQN/main.py", line 14, in <module>
    pos = nx.nx_agraph.graphviz_layout(g.to_undirected(), prog='neato')
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/networkx/drawing/nx_agraph.py", line 228, in graphviz_layout
    return pygraphviz_layout(G,prog=prog,root=root,args=args)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/networkx/drawing/nx_agraph.py", line 262, in pygraphviz_layout
    A.layout(prog=prog,args=args)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pygraphviz/agraph.py", line 1358, in layout
    data = self._run_prog(prog, ' '.join([args, "-T", fmt]))
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pygraphviz/agraph.py", line 1338, in _run_prog
    warnings.warn(b"".join(errors), RuntimeWarning)
TypeError: cannot use a string pattern on a bytes-like object

如果我使用Python 2.7.x运行相同的代码（只需要更改＆＃39; print（arg）＆＃39;打印arg＆＃39;）我得到以下输出（吨警告，但它有效）：

/usr/local/bin/fdp
/usr/local/lib/python2.7/site-packages/pygraphviz/agraph.py:1338: RuntimeWarning: Warning: node 0, position [ 5.50797903  7.08147823], expected two floats
Warning: node 12, position [ 5.44649018  7.80314765], expected two floats
[... here other warnings of the same kind]
Warning: Overlap value "prism" unsupported - ignored

  warnings.warn(b"".join(errors), RuntimeWarning)

所以我的问题是，如何让pygraphviz与Python3一起使用？我不知道在哪里看。请注意，从终端或Eclipse运行上述代码时出现的错误没有区别。

是否与Python3不兼容？我记得几年前被告知为了科学目的＆＃34;使用Python2.x可能仍然更好。这仍然是这样吗？

非常感谢您的帮助！

Answer 1

来自graphviz的错误的字节/字符串处理中出现了一个错误，该错误出现在Python 3中。修复已包含在pygraphviz github主分支中（https://github.com/pygraphviz/pygraphviz/pull/104）。您可以从https://github.com/pygraphviz/pygraphviz下载，直到我们发布新版本。

n.b。 pygraphviz与Python3一起正常工作。

Pygraphviz / Python3 / Mac：TypeError

1 个答案: