(Python)ValueError:路径中找不到程序点

Question

我有以下问题:我在xUbuntu操作系统上,我试图在Flask应用程序中使用networkx,我有以下代码:

.....
import networkx as nx
......
# Creating and initializing graph object which is networkx object
hosts_graph = get_networkx_graph_object()

# Variable 'coord' where the coordinates for each node will be stored
coord = nx.pygraphviz_layout(hosts_graph, prog = 'dot')

最后一行是411行.我收到以下错误:

File "/home/kiril/Documents/workfolder/omeganoc-sprint/onoc/omeganoc/grapher.py", line 411, in grouping_method
    coord = nx.pygraphviz_layout(hosts_graph, prog = 'dot')
  File "/usr/local/lib/python2.7/dist-packages/networkx-1.7-py2.7.egg/networkx/drawing/nx_agraph.py", line 264, in pygraphviz_layout
    A.layout(prog=prog,args=args)
  File "/usr/local/lib/python2.7/dist-packages/pygraphviz-1.1-py2.7-linux-x86_64.egg/pygraphviz/agraph.py", line 1301, in layout
    data=self._run_prog(prog,' '.join([args,"-T",fmt]))
  File "/usr/local/lib/python2.7/dist-packages/pygraphviz-1.1-py2.7-linux-x86_64.egg/pygraphviz/agraph.py", line 1248, in _run_prog
    runprog=self._get_prog(prog)
  File "/usr/local/lib/python2.7/dist-packages/pygraphviz-1.1-py2.7-linux-x86_64.egg/pygraphviz/agraph.py", line 1236, in _get_prog
    raise ValueError("Program %s not found in path."%prog)
ValueError: Program dot not found in path.

什么可能导致这个问题？我已经安装了networkx和pygraphviz,但我仍然遇到这个错误.任何想法如何解决这个问题？

Answer 1

没有Graphviz,PyGraphviz不起作用.也安装.

Answer 2

如果安装了Anaconda,最简单的方法是从CMD运行以下命令:

conda install pydot-ng

和:

conda install graphviz

这需要在路径中添加点.

Answer 3

确保通过Windows安装程序安装Graphviz(可从http://www.graphviz.org/Download_windows.php下载).

然后将bin折叠的路径添加到系统变量"Path".它是bin fold中的"dot.exe",由pygraphviz查找.

如果你点击安装graphviz它不起作用.