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: