NameError: name 'tree' is not defined

Hey I'm new to Python and I am trying to follow along with a tutorial but I get this error:

NameError: name 'tree' is not defined.

The objective is obviously for the program to determine whether the fruit is an apple or orange based on the input of features. I'm using Python 3.6 with the spyder editor on Win 10. I'm sure it's something simple, thanks for any help!

# -*- coding: utf-8 -*-
Spyder Editor

This is a temporary script file.

# features = [[140, "smooth"], [130, "smooth"], [150, "bumpy"], [170, "bumpy"]]
# labels = ["apple", "apple", "orange", "orange"]
features = [[140, 1], [130, 1], [150, 0], [170, 0]]
labels = [0, 0, 1, 1]
# We build a "Decision Tree" yes/no -> yes/no
# clf means classifier
clf = tree.DecisionTreeClassifier()
# Think of "fit" as "find patters in data"
clf =, labels)
print (clf.predict([[160, 0]]))

Add this to the top of your code:

from sklearn import tree

This is assuming that you are studying machine learning.

input() error - NameError: name '' is not defined, It's possible that you misspelt the name of the object or forgot to import something . Also maybe it's in another scope. We'll cover those with separate examples. It's� NameError: name 'Tree' is not defined That's because the class has not been defined yet at this point. The workaround is using so called Forward Reference, i.e. wrapping a class name in a string, i.e. class Tree: def __init__(self, left: 'Tree', right: 'Tree'): self.left = left self.right = right

from sklearn.tree import DecisionTreeClassifier

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I tried this from sklearn import tree it does not work on my system.

Then I tried this from sklearn.tree import DecisionTreeClassifier and worked.

This is after installing sklearn of course.

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  • You have to import some module. It is probably written in the tutorial which.
  • I downloaded anaconda which must include sklearn because it worked after I did the import. Thanks a lot @BoobyTrap, cant believe I didn't see that.
  • Why this answer was voted down!, would you give a good reason?