Python Alternatives?

[Michael Milliman]

I currently have both Python 2.7 and Python 3.4 installed on my debain 
8.5 (jessie) system.  The default Python interpreter on the system is 
Python 2.7 (as linked by /usr/bin/python).  I would prefer this default 
to be Python 3.4.  I can, of course manually change the link in /usr/bin 
to point to Python 3.4, however, I am concerned that doing this may 
defeat some other available method for making this change. I note that 
update-alternatives does not have a group for the Python interpreter, 
and so cannot be used for this change.  Is there some other more 
acceptable method for making this change other than just manually 
changing the line /usr/bin/python to point to python3.4 instead of 
python2.7?

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73's de Mike, WB5VQX