Python scripts compatibility

[iddm]

1. Python scripts should choose correct interpreter.

   #!/usr/bin/python2 or #!/usr/bin/python3 or better #!/usr/bin/env python2 etc.

2. There should be compatible or both versions for python 2 and python 3. I can't run the script with python3 and I don't need and I don't have python 2 installed on my system. To be more user(reader)-friendly, I suggest to provide with compatible scripts (which can run in both 2 and 3 versions of Python), or different versions of the same script for 2 and 3 versions accordingly.