title: Setting default interpreter for a python script
body: <p>I am using a module that can only be found in python 2.7, so when I run my script I have to specify <code>python2.7 script</code> instead of just <code>script</code>. I know there are bigger issues out there, but still I was wondering - 
  is it possible, when writing a python script, to set the interpreter to 2.7 by default?
  Maybe by setting <code>#! /usr/bin/env python</code> for example?</p>