title: Splitting a string in a Python DataFrame
body: <p>I have a DataFrame in Python with a column with names (such as Joseph Haydn, Wolfgang Amadeus Mozart, Antonio Salieri and so forth). </p>
  
  <p>I want to get a new column with the last names: Haydn, Mozart, Salieri and so forth. </p>
  
  <p>I know how to split a string, but I could not find a way to apply it to a series, or a Data Frame column. </p>