title: changing the format of timestamp in python
body: <p>I am trying to change the timestamp from one format to another. I tried some approaches but i am not able to succeed.</p>
  
  <p>This is my timestamp
  <strong>151005-12:07:34.917928</strong></p>
  
  <p>I would like to change it to a format like this 
  <strong>2015-10-05 12:07:34:917928</strong></p>
  
  <p>Thanks in Advance</p>