How to Use virtualenvwrapper: A Basic Overview

Once you have virtualenvwrapper installed...here's how to:

CREATE A NEW VIRTUAL ENVIRONMENT

mkvirtualenv env1

will create a virtual environment by the name of env1.

OPEN UP A VIRTUAL ENVIRONMENT
First things first, go reward yourself with a bag of Cheetos. That was hard work. Once you've wiped all the neon orange, dangerously cheesy residue off your fingers, and you're ready to work, enter

workon env1

into your Terminal, and you're good to go.

In your command line, you know you're successfully in a virtual environment when you see the name of the environment in parenthesis before the $ symbol, like this:

(env1)$ 

EXIT YOUR VIRTUAL ENVIRONMENT
Simply enter:

deactivate

The parenthesis should be gone and the next line in your Terminal should look normal.

FORGOT YOUR VIRTUAL ENVIRONMENTS?
To see a list all the virtual environments on your system, fire up your Terminal and run

lsvirtualenv

To see what packages you have installed in a particular virtual environment, activate the virtual environment with:

workon name_of_your_virtual_environment

and then enter:

pip list

Easy as pie. Or sloth snacks.