No module named 'sklearn.externals.six'

Question

# Import following modules and libraries to visualize the tree:

from sklearn.tree import DecisionTreeClassifier, export_graphviz
from sklearn.externals.six import StrinIO
import pydotplus

dot_data = StringIO()
export_graphviz(dtc, out_file="mytree.dot",feature_names=col[1:27],filled=True,rounded=True,special_characters=True)
graph= pydotplus.graph_from_dot_data(dot_data.getvalue())

Answer 1

sklearn.externals.six is deprecated You should be able to using StringIO by directly importing it from the module six :

from six import StringIO

As you did not provide an example to run the rest of your code, I don't know whether it will work