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

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The problem is that the path to GraphViz was not found by the pydot module as shown in the traceback:

‘GraphViz\’s executables not found’

I solved this problem on my windows 7 machine by adding the GraphViz bin directory to my computer’s PATH. Then restarting my python IDE to use the updated path.

  1. Install GraphViz if you haven’t already (I used the MSI download)
  2. Get the path for gvedit.exe (for me it was “C:\Program Files
    (x86)\Graphviz2.34\bin\”)
  3. Add this path to the computer’s PATH
  4. One way to get to environment settings to set your path is to click on each of these button/menu options: start->computer->system
    properties->advanced settings->environment variables
  5. Click Edit User path
  6. Add this string to the end of your Variable value list (including
    semicolon): ;C:\Program Files (x86)\Graphviz2.34\bin
  7. Click OK
  8. Restart your Python IDE

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