title: How to import pydotplus in spyder 3.6
body: <p>I am currently using spyder 3.6 on Windows 8 OS and whenever I run this code 
  it shows an error </p>
  
  <p>File "", line 12, in 
      import pydotplus</p>
  
  <p>ModuleNotFoundError: No module named 'pydotplus'</p>
  
  <p>Here is the code</p>
  
  <pre><code>import pydotplus 
  dot_data = tree.export_graphviz(clf, out_file=None) 
  
  graph = pydotplus.graph_from_dot_data(dot_data) 
  
  graph.write_pdf("iris.pdf") 
  
  from IPython.display import Image  
  dot_data = tree.export_graphviz(clf, out_file=None,feature_names=iris.feature_names,  
  
  class_names=iris.target_names,  
  
  filled=True, rounded=True,  
  
  special_characters=True)
  
  graph = pydotplus.graph_from_dot_data(dot_data)  
  
  Image(graph.create_png())
  </code></pre>