The “officially” supported versions of Python are the versions that ship with Softimage.
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On Windows:
Python 2.6.4 & PyWin 212
We didn’t go with 2.7 because of a bug in PyWin 214.You can use Python 2.7 if you have it installed on your system: just disable the internal Python in the scripting preferences.
Softimage won’t work with Python 3.x
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On Linux:
Python 2.5
Softimage ships with Python 2.5 because we needed to compile [and distribute] the pywin32 module for a specific Python version on Linux.