title: Why does this AttributeError in python occur?
body: <p>There is one thing, that I do not understand.</p>
  
  <p>Why does this</p>
  
  <pre><code>import scipy # happens with several other modules, too. I took scipy as an example now...
  
  matrix = scipy.sparse.coo_matrix(some_params)
  </code></pre>
  
  <p>produce this error:</p>
  
  <pre><code>AttributeError: 'module' object has no attribute 'sparse'
  </code></pre>