Nerdy Weekly

Thoughts on programming and other stuff that matters

Virtualenv(wrapper), python2 and python3

Virtualenv and virtualenvwrapper make it super easy to have a sandboxed python environment for each of your projects, no doubt about it (if you’re not using them already, feel free to google how to get started).

By default, mkvirtualenv my-env-name will create a virtualenv using the OS’s default python version (in Ubuntu’s case, that’s python2). If you want a virtualenv that has python mapped to python3 instead, use the -p argument:

$ mkvirtualenv -p `which python3` my-env-name
# assumming you have python3 installed already, of course!

However, on Ubuntu this will fail if you installed virtualenv as a pip package. If that’s the case, simply remove it and install the Ubuntu package instead. It goes like this for Ubuntu 14.04:

$ sudo pip uninstall virtualenv
$ sudo apt-get install python-virtualenv
$ sudo pip install virtualenvwrapper  # yes, you can install virtualenvwrapper via pip
$ mkvirtualenv -p `which python3` my-env-name

Neat, eh?