OSX Lion ships with python 2.7 as the default, but there is a way to make it use 2.6 by default. The following was retrieved from http://stackoverflow.com/questions/6998545/how-can-i-make-python-2-6-my-default-in-mac-os-x-lion $ man python $ which python /usr/bin/python $ python -V Python 2.7.1 # # temporarily change version # $ export VERSIONER_PYTHON_VERSION=2.6 $ python -V Python 2.6.6 $ unset VERSIONER_PYTHON_VERSION ...