Recommend add2virtualenv: Page 39, Chapter 5.2, TIP section

[rkulla]

Since virtualenvwrapper was mentioned earlier in the book (pg14, ch2), I feel that it would also be worth mentioning virtrtualenvwrapper's "add2virtualenv" path management command for setting PYTHONPATH. Mentioning this would probably be best in Chapter 5.2's TIP section on Page 39.

Many people get confused and only set DJANGO_SETTINGS_MODULE but not PYTHONPATH, and end up editing manage.py. Or they aren't aware of virtualenvwrapper's add2virtualenv command, which allows them to simply run add2virtualenv [dir-to-add] and the path info will show up in the _virtualenv_path_extensions.pth file located inside the sites-packages directory for the environment. We can can then verify this by running python -c 'import sys ; print sys.path'.

I got this to work with 2 scoops with: add2virtualenv /tmp/icecream.com/icecream_project/icecream_project/icecream_project

This dynamically adds a python path to ~/.virtualenvs/icecream.com/lib/python2.7/site-packages/_virtualenv_path_extensions.pth. I then set DJANGO_SETTINGS_MODULE permanently for the virtualenv with echo "export DJANGO_SETTINGS_MODULE=settings.local" >> $VIRTUAL_ENV/bin/postactivate

Reference: http://virtualenvwrapper.readthedocs.org/en/latest/command_ref.html#path-management