title: ImportError: No module named class_vis
body: <p>Have I missed the boat on this? I've scoured the net for information on installing a package, notably prettyPicture, but there is nothing out there. Is this not in use anymore?</p>
  
  <pre><code>import numpy 
  import matplotlib
  matplotlib.use('agg')
  import matplotlib.pyplot as plt
  #from studentRegression import studentReg
  from class_vis import prettyPicture, output_image
  
  from ages_networths import ageNetWorthData
  
  ages_train, ages_test, net_worths_train, net_worths_test = ageNetWorthData()
  
  reg=studentReg(ages_train,net_worths_train)
  
  plt.clf()
  plt.scatter(ages_train,net_worths_train,color="b",label="train data")
  plt.scatter(ages_test, net_worths_test, color='r', label="test data")
  plt.plot(ages_test, reg.predict(ages_test), color="black")
  plt.legent(loc=2)
  plt.xlabel("ages")
  plt.ylabel("net worths")
  
  plt.savefig("test.png")
  output_image("test.png", "png", open("test.png", "rb").read())
  </code></pre>
  
  <p>Error Message:</p>
  
  <blockquote>
  <pre><code>ImportError                               Traceback (most recent call last)
  &lt;ipython-input-10-7e6ab2d3ca3d&gt; in &lt;module&gt;()
        5 import matplotlib.pyplot as plt
        6 #from studentRegression import studentReg
  ----&gt; 7 from class_vis import prettyPicture, output_image
        8 
        9 from ages_networths import ageNetWorthData
  
  ImportError: No module named class_vis
  </code></pre>
  </blockquote>