title: Python 3.3.2 and 2.7.5 first line code on Windows?
body: <p>I am new to python.
  I have installed both version python 3.3.2 and 2.7.5 (Windows 7)</p>
  
  <p>python 3.3 directory : c:\python33</p>
  
  <p>python 2.7 directory : c:\python27</p>
  
  <p>python33 was installed first.</p>
  
  <p>What will be first line of code for both version of python?
  like as #! /user/bin/python ???
  more importantly why this line is important ?</p>