title: Round float columns in pandas dataframe
body: <p>I have got the following pandas data frame</p>
  
  <pre><code>          Y         X id WP_NER
  0 35.973496 -2.734554  1  WP_01 
  1 35.592138 -2.903913  2  WP_02 
  2 35.329853 -3.391070  3  WP_03 
  3 35.392608 -3.928513  4  WP_04 
  4 35.579265 -3.942995  5  WP_05 
  5 35.519728 -3.408771  6  WP_06 
  6 35.759485 -3.078903 7 WP_07 
  </code></pre>
  
  <p>I´d like to round Y and X columns using pandas. 
  How can I do that ?</p>