title: pandas: find percentile stats of a given column
body: <p>I have a pandas data frame my_df, where I can find the mean(), median(), mode() of a given column:</p>
  <pre><code>my_df['field_A'].mean()
  my_df['field_A'].median()
  my_df['field_A'].mode()
  </code></pre>
  <p>I am wondering is it possible to find more detailed stats such as 90 percentile? Thanks!</p>