(Python)ValueError:在路径中找不到程序点 [英] (Python) ValueError: Program dot not found in path

问题描述

我遇到以下问题:我在xUbuntu OS上，并且试图在Flask应用程序中使用networkx，并且我有以下代码:

I have the following problem: I am on xUbuntu OS and I am trying to use networkx in a Flask application, and I am having the following code:

.....
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')

最后一行是第411行.出现以下错误:

The last line is line 411. I get the following error:

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.

什么可能导致此问题?我已经安装了networkx和pygraphviz，但是仍然出现此错误.有什么想法可以解决这个问题吗?

What could be causing this problem? I've installed networkx and pygraphviz, but I still get this error. Any ideas how to solve this problem?

推荐答案

没有Graphviz，PyGraphviz无法正常工作.还要安装它.

PyGraphviz doesn't work without Graphviz. Install that too.

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