title: Renaming values in pandas
body: <p>I do have a DataFrame like this:</p>
  
  <pre><code>col1  col 2
  abc   sure
  def   yes
  ghi   no
  jkl   no 
  mno   sure
  pqr   yes
  stu   sure
  </code></pre>
  
  <p>My intention is to rename "sure" and "yes" into "confirm", so that the DataFrame looks like:</p>
  
  <pre><code>col1  col 2
  abc   confirm
  def   confirm
  ghi   no
  jkl   no 
  mno   confirm
  pqr   confirm
  stu   confirm
  </code></pre>
  
  <p>How to do this :)?</p>