Managing Python Script File Extensions
You can run both Python versions 2.3 and 2.4. Files running under different versions of Python can all use the same .py extension if the version is specified in the script itself. To specify the version, type one of the following at the top of a Python script:
Python 2.3
#!/usr/bin/python2.3
Python 2.4
#!/usr/bin/python2.4
