title: How to iterate over two variables at same time?
body: <p>My code looks as follows:</p>
  
  <pre><code>startDates = ['2011-01-01','2012-01-01']
  endDates = ['2013-01-01','2014-01-01']
  theJuice = []
  
  for startDate in startDates and endDate in endDates:
      start_date = startDate 
      end_date = endDate
      print start_date
      print end_date
  </code></pre>
  
  <p>I hope you can help me.</p>