Have you installed Python 2.7 or Python 3? 
I suspect that most of these older scripts that you're trying to run will NOT work with Python 3... so make sure you have downloaded and installed Python 2.7 from here: https://www.python.org/downloads/release/python-2717/
I suspect that most of these older scripts that you're trying to run will NOT work with Python 3... so make sure you have downloaded and installed Python 2.7 from here: https://www.python.org/downloads/release/python-2717/