title: How to partition pandas data frame based on week and save as CSV?
body: <p>I have a pandas data frame as below. This data frame about one month period.  How do I partition this data frame based on week? I need save each 4 weeks as seperate 4 CSV files. </p>
  
  <pre><code>Time Stamp              Id  Latitude    Longitude
  01/10/2016 15:22:51:700 1      23        50
  01/10/2016 16:28:08:026 1      23        50
  01/10/2016 16:28:09:026 1      12        45
  02/10/2016 19:00:08:026 2      23        50
  02/10/2016 20:28:08:026 1      23        50
  03/10/2016 19:00:08:000 2      23        50
  03/10/2016 01:02:33:123 2      23        50
  03/10/2016 06:15:08:500 1      23        50
  03/10/2016 10:01:07:022 3      28        88
  ......
  ......
  31/10/2016 13:09:17:044 1      33        80
  </code></pre>
  
  <p>My expected output is:</p>
  
  <pre><code>Time Stamp              Id  Latitude    Longitude
  01/10/2016 15:22:51:700 1      23        50
  01/10/2016 16:28:08:026 1      23        50
  01/10/2016 16:28:09:026 1      12        45
  02/10/2016 19:00:08:026 2      23        50
  02/10/2016 20:28:08:026 1      23        50
  03/10/2016 19:00:08:000 2      23        50
  03/10/2016 01:02:33:123 2      23        50
  03/10/2016 06:15:08:500 1      23        50
  03/10/2016 10:01:07:022 3      28        88
  ......
  ......
  07/10/2016 03:09:10:066 5      28        78
  </code></pre>
  
  <p>This should be my first week. Next weeks from 08/10/2016 to 14/10/2017, from 15/10/2016 to 21/10/2017 and from 22/10/2016 to 31/10/2017. </p>