I have Python 2.7 (my preferred version) and 3.3 (version used in my Programming class) installed on my computer (OS: Windows 7). Until a certain point, they worked fine ind
The Python documentation for python 3.2 provides information which helped me to call different python 2.7 and 3.3 separately.
http://docs.python.org/3/using/windows.html#customizing-default-python-versions