title: Hash every element of a list of strings in a pandas Dataframe column
body: <p>So I have a dataframe like this</p>
  
  <pre><code>   customer     location       trip_len
  0     a      ['1', '2', '3']      3
  1     b      ['4', '5']           2
  </code></pre>
  
  <p>And I am trying to hash, for every row, every element on the list of strings on the column 'location' in order to improve efficiency in my model. How would this be possible?</p>