title: Daterange split with individual start and end dates in Pandas
body: <p>I'm working in Python with Pandas, and need to divide a date range in multiple date ranges - and need both the start and end dates for these ranges</p>
  
  <p>So something like: </p>
  
  <pre><code>pd.date_range(start='20180301', end='20180311',freq='3D')
  </code></pre>
  
  <p>should generate a list with two values per item:</p>
  
  <pre><code>[0] 20180301, 20180303
  [1] 20180304, 20180306
  [2] 20180307, 20180309
  [3] 20180310, 20180311
  </code></pre>
  
  <p>(last period is shorter than 3 days but ends with the overall enddate)</p>