title: How to add a suffix (or prefix) to each column name?
body: <p>I want to add <code>_x</code> suffix to each column name like so:</p>
  
  <pre><code>featuresA = myPandasDataFrame.columns.values + '_x'
  </code></pre>
  
  <p>How do I do this? Additionally, if I wanted to add <code>x_</code> as a suffix, how would the solution change?</p>