title: Error using sklearn.dataset
body: <p>I am trying to visualize some data. However, I am receiving the following error:</p>
  
  <pre><code>Traceback (most recent call last):
  File "/Users/usrname/PycharmProjects/MachineLearning/dddd.py", line 4, in &lt;module&gt;
  from sklearn.datasets import load_iris
  File "/usr/local/lib/python2.7/site-packages/sklearn/__init__.py", line 32, in &lt;module&gt;
  from .base import clone
  File "/usr/local/lib/python2.7/site-packages/sklearn/base.py", line 10, in &lt;module&gt;
  from scipy import sparse
  ImportError: No module named scipy
  </code></pre>
  
  <p>Below, there is the code to visualize the data. </p>
  
  <pre><code>from matplotlib import pyplot as plt
  from sklearn.datasets import load_iris
  import numpy as np
  # We load the data with load_iris from sklearn
  data = load_iris()
  features = data['data']
  feature_names = data['feature_names']
  target = data['target']
  for t,marker,c in zip(xrange(3),"&gt;ox","rgb"):
     # We plot each class on its own to get different colored markers
     plt.scatter(features[target == t,0],features[target == t,1],marker=marker,c=c)
  </code></pre>
  
  <p>I am using the the Python 2.7, Mac OS "Mavericks". </p>