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')
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.
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?
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Answer
PyGraphviz doesn’t work without Graphviz. Install that too.