title: Move given row to end of DataFrame
body: <p>I would like to take a given row from a DataFrame and prepend or append to the same DataFrame. </p>
  
  <p>My code below does just that, but I'm not sure if I'm doing it the right way or if there is an easier, better, faster way?</p>
  
  <pre><code>testdf = df.copy()
  #get row 
  target_row = testdf.ix[[2],:]
  #del row from df
  testdf.drop([testdf.index[2]], axis=0, inplace=True)
  #concat original row to end or start of df
  newdf = pd.concat([testdf, target_row], axis=0)
  </code></pre>
  
  <p>Thanks</p>