title: Does sql-alchemy filter accept multiple parameters?
body: <p>I am following a flask/sqlalchemy tutorial and I am familiar with <code>query.filter</code> however, I don't understand what this code mean:
  <code>Question.query.filter(Question.id.notin_(previous_questions), Question.category == category_id).all()</code>
  Can someone explain to me how the <code>filter</code> got 2 parameters and what does <code>notin_</code> mean?</p>