title: In[] and Out[] in code
body: <p>Please can somebody explain to me, or point to a reference, what the <code>In [5]</code> and <code>Out[5]</code> in the following code mean:</p>
  
  <pre><code>In [5]: list(set(temp1) - set(temp2))
  Out[5]: ['Four', 'Three']
  </code></pre>