step #3

create_virtualenv.sh

#!/bin/sh
tar xvzf virtualenv-1.11.6.tar.gz
cd virtualenv-1.11.6
sudo python virtualenv.py ../$1
cd ..

# activate the virtualenv, install the requirements
source $1/bin/activate
sudo pip install -r mac_requirements.txt

# symlink wx.pth in
sudo ln -s /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/wxredirect.pth ./$1/lib/python2.7/site-packages

# cleanup a bit
rm -rf virtualenv-1.11.6
deactivate
 
cd $1/bin
# rename the python interpreter because wx doesn't like to play with others
sudo mv python python_original
# symlink in the framework build so we can instantiate wx.App objects
sudo ln -s /Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7 ./python  # this means we use the framework build for wx stuff
cd ../..

# export the PYTHONHOME variable so that interpreters use our libraries
sudo sh -c "echo export PYTHONHOME=$PWD/$1 >> $1/bin/activate"