title: datasets.load_iris() in Python
body: <p>What does the function <code>load_iris()</code> do ?
  Also, I don't understand what type of data it contains and where to find it.</p>
  
  <pre><code>iris = datasets.load_iris() 
  X = iris.data 
  target = iris.target 
  names = iris.target_names
  </code></pre>
  
  <p>Can somebody please tell in detail what does this piece of code does?
  Thanks in advance.</p>