title: convert grouped data with groupby to dataframes
body: <p>how can i do to convert my grouped data to data frame. Each group in one dataframe? 
  i did this to group my data 
  I wrote:</p>
  
  <pre><code>df = pd.DataFrame({'Animal' : ['Falcon', 'Falcon',
                                 'Parrot', 'Parrot'],
                     'Max Speed' : [380., 370., 24., 26.]})
  df.groupby('Animal')
  </code></pre>