title: How to find all rows in a dataframe that contain a substring?
body: <p>I have one word and a Pandas dataframe with a column of string values. Now I'm trying to find the rows in that dataframe which contain that word in their string part.</p>
  <p>I read about <code>extractall()</code> method but I'm not sure how to use it or if its even the right answer.</p>