Graphviz's executables are not found (Python 3.4)

Question

I am running Python3.4 on Windows 7. I am trying to use the Python interface for graphviz. This is a script I intend to run:

from graphviz import Digraph
imp         


        

Answer 1

I tried setting up Environment variable. Didn't work.I am in Windows environment Combining above methods worked for me :

1. Downloaded graphviz-2.38.zip from https://graphviz.gitlab.io/_pages/Download/Download_windows.html

2. Copied the extracted folder into C:\Users\\AppData\Local\Continuum\anaconda3\pkgs\Graphviz2.38

3. I called the Graphviz location in my code

   Build the classifier

   import sklearn.datasets as datasets
   import pandas as pd
   from sklearn.tree import DecisionTreeClassifier
   iris=datasets.load_iris()
   df=pd.DataFrame(iris.data, columns=iris.feature_names)
   y=iris.target
   
   dtree=DecisionTreeClassifier()
   dtree.fit(df,y)
   

   Build the tree

   from sklearn.externals.six import StringIO  
   from IPython.display import Image  
   from sklearn.tree import export_graphviz
   import pydotplus
   import graphviz
   import os
   os.environ\["PATH"\] += os.pathsep + 'C:/Users/tstusr/AppData/Local/Continuum/anaconda3/pkgs/Graphviz2.38/bin'
   
   dot_data = StringIO()
   export_graphviz(dtree, out_file=dot_data,  
                   filled=True, rounded=True,
                   special_characters=True)
   graph = pydotplus.graph_from_dot_data(dot_data.getvalue())  
   Image(graph.create_png())
   

   Here is how the tree looks:

Answer 2

As it appears, Graphviz2.37 is known to have problems with the PATH variable on windows. I uninstalled it, removed the environment variables associated with it and instead downloaded and installed the newer beta version 2.39 and it now works like a charm.

Answer 3

Tried many ways and here is what really solved the problem - it worked for both windows 8.1/10 & python 3 .

1 . pip install graphviz

2 . the key action needed is to set the path variable by following steps below:

a. Control Panel > System and Security > System > Advanced System Settings > Environment Variables > Path > Edit b. add 'C:\Program Files (x86)\Graphviz2.38\bin'

Answer 4

For windows 8.1 & python 2.7 , I fixed the problem by following below steps

1 . Download and install graphviz-2.38.msi http://www.graphviz.org/pub/graphviz/stable/windows/graphviz-2.38.msi

2 . Set the path variable

• Control Panel > System and Security > System > Advanced System Settings > Environment Variables > Path > Edit
• add 'C:\Program Files (x86)\Graphviz2.38\bin'

Answer 5

I solved it installing directly from https://graphviz.gitlab.io/_pages/Download/Download_windows.html and including in windows path:

C:\Program Files (x86)\Graphviz2.38\bin

C:\Program Files (x86)\Graphviz2.38

After I restart windows

Answer 6

I am not sure if this is an answer to THIS question, but this also seems to be the "how do I get graphviz to run on my setup?" thread. I also did not see python-graphviz mentioned anywhere.

As such: Ubuntu 16.04, conda Python 3.7, using Jupyter notebooks.

conda install -c anaconda graphviz
conda install -c conda-forge python-graphviz

The images would not render after trying only the first command; they did render after running the second.

I also installed pydot-plus, but did not see any change in behavior, performance, or image resolution.