install:

0-) You need to have virtualenvwrapper installed

1-) first install pyenv:

git clone git://github.com/yyuu/pyenv.git ~/.pyenv

2-) then just:

git clone git://github.com/andersoncardoso/pyenv-autoenv.git ~/.pyenv/plugins/pyenv-autoenv

3-) add these lines to your .bashrc or .zshrc:

if [[ -d $HOME/.pyenv ]];then
    export PATH="$HOME/.pyenv/bin:$PATH"
    eval "$(pyenv init -)"
    source ~/.pyenv/plugins/pyenv-autoenv/bin/pyenv-autoenv
fi

How it works:

Pyenv already has a behavior where: whenever you enter a directory with a .python-version file set with a version number in, he autoloads that python version.

I've extended this behavior to work with virtualenvwrapper. So whenever you enter a dir with a .python-env set with a virtualenv name, he activates that environment automatically.

Another aditional behavior is: If you don't have the python version from .python-version installed, he automatically installs it for you. And if you dont have the virtualenv from .python-env created, he creates and load it for you. TODO: make this optional

Example: if you have a project on git with a .python-version with 2.7.5 in it, and a .python-env with my_env. When you clone it, all need to do is cd into the project's directory and it will load (and install if needed) both the python-2.7.5 and the my_env virtualenv (uses virtualenvwrapper so you need to have it installed).