I would suggest Python 2.6.x and then gradually move on to Python 3.x. The reason is python 3.x is very very new and it breaks backward compatibility with older version. For this reason, migration of existing python applications to 3.x version will take a quite a bit of time. People are always wary of moving to a newer release of the same product.
I'm new to the platform and I'm attached to a project that need to create a program that allows the operator to indicate the PIC of any issue/downtime on the machine.
We're using UNIX platform and I've to attached the program in the active/test monitor program.