No errors when I run python and it seems I do have version 2.7.3
gsuarez@geomachinex:~/cad/glade4_linux64_ub10$ python
Python 2.7.3 (default, Aug 1 2012, 05:14:39)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>>
Here's what I get for "which python".
gsuarez@geomachinex:~/cad/glade4_linux64_ub10$ which python
python is /usr/bin/python
And it seems python is just a symbolic link to python2.7
lrwxrwxrwx 1 root root 9 Nov 13 11:11 /usr/bin/python -> python2.7