title: Print command not showing anything in jupyter notebook
body: <p>I am using jupyter notebook and it seems like the print function is not working:</p>
  
  <p>The commands are as follows:</p>
  
  <pre><code>In [1]: 'hello world'
  Out [1]: 'hello world'
  
  In [2]: print 'hello world'
  </code></pre>
  
  <p>print statement is not printing anything.
  Does anyone know whether it's a known bug? </p>