title: Print pandas df with style.format in iPython
body: <p>Minimal working example:</p>
  
  <pre><code>import pandas as pd
  df = pd.DataFrame({
      'letters':('A', 'B', 'C'),
      'numbers':(0.1111, 0.2222, 0.3333)
  }).set_index('letters')
  df.style.format('{:.2f}')
  </code></pre>
  
  <p>Result:</p>
  
  <pre><code>Out[4]: &lt;pandas.io.formats.style.Styler at 0x7f963f826eb8&gt;
  </code></pre>
  
  <p>What I want:</p>
  
  <p>Something similar to the default Jupyter output:</p>
  
  <p><a href="https://i.stack.imgur.com/mQsSL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mQsSL.png" alt="jupyter_output"></a></p>