title: Hash each value in a pandas data frame
body: <p>In python, I am trying to find the quickest to hash each value in a pandas data frame.</p>
  
  <p>I know any string can be hashed using:</p>
  
  <pre><code>hash('a string')
  </code></pre>
  
  <p>But how do I apply this function on each element of a pandas data frame?</p>
  
  <p>This may be a very simple thing to do, but I have just started using python. </p>