title: Can i reassign the values to same variables in python
body: <p>I have this variable in python</p>
  
  <pre><code>DATE_FILENAME =  datetime.datetime.now().strftime("%b-%d-%Y-%I%M%p")
  </code></pre>
  
  <p>Now this is supposed to have diff value every time .
  But i have heard that strings are immutable does it mean that it will hold only one value</p>
  
  <p>This is the result  <code>_May-22-2011-1002PM.tar.gz</code></p>
  
  <p>my script took 3 minutes for backing up 8 folders but all have the same date_filename part. so i wanted to know why it didn't chnaged</p>