virtualenv is very useful in developing Python because you can create your project’s own environment without polluting the or messing with the global or your other projects¬†Python environment.

First make sure that you have already installed virtualenv and pip for Python 3.

$ sudo apt-get install python3-pip 
$ sudo pip3 install virtualenv

After installing both pip and virtualenv for Python 3 you can now create a virtualenv by entering this:

 $ virtualenv --no-site-packages --distribute -p /usr/bin/python3 env

or

 $ python3 -m virtualenv env

The “env” at the last part is where virtualenv will create the Python 3 environment.

To make sure that we really have created a Python 3 environment. Activate the virtualenv and check the Python version.

$ source env/bin/activate
$ python --version
Python 3.4.0
$

As you can see at line 4 mine is already setup and is using Python 3.4.0.