I'm still learning Python, so I could be way off here. It's from my understanding that virtualenv was a standalone package, and now Python 3 has it built-in? I didn't see that in the guide, but people online seem to repeat this information. For example:http://askubuntu.com/a/353903

This would be in reference to this page:http://docs.python-guide.org/en/latest/dev/virtualenvs/