graphvizscikit-learnpygraphvizpydot

Why is pydot unable to find GraphViz's executables in Windows 8?

I have GraphViz 2.32 installed in Windows 8 and have added C:\Program Files (x86)\Graphviz2.32\bin to the System PATH variable. Still pydot is unable to find its executables.

Traceback (most recent call last):
  File "<pyshell#26>", line 1, in <module>
    graph.write_png('example1_graph.png')
  File "build\bdist.win32\egg\pydot.py", line 1809, in <lambda>
    lambda path, f=frmt, prog=self.prog : self.write(path, format=f, prog=prog))
  File "build\bdist.win32\egg\pydot.py", line 1911, in write
    dot_fd.write(self.create(prog, format))
  File "build\bdist.win32\egg\pydot.py", line 1953, in create
    'GraphViz\'s executables not found' )
InvocationException: GraphViz's executables not found

I found this https://code.google.com/p/pydot/issues/detail?id=65 but am unable to get the problem solved.

Solution

  • This happened because I had installed graphviz after I had installed pydot. Hence, pydot wasn't able to find it. Reinstalling it in the correct order solved the problem.