title: In Pandas, how to delete rows from a Data Frame based on another Data Frame?
body: <p>I have 2 Data Frames, one named USERS and another named EXCLUDE. Both of them have a field named &quot;email&quot;.</p>
  <p>Basically, I want to remove every row in USERS that has an email contained in EXCLUDE.</p>
  <p>How can I do it?</p>