$ curl -L https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/pyenv-installer | bash

export PATH="/home/kongxx/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

$ .~/.bashrc

$ pyenv versions
* system (set by /home/kongxx/.pyenv/version)

$ pyenv install -l
Available versions:
 2.1.3
 2.2.3
 2.3.7
 2.4
 2.4.1
...

$ pyenv install 2.7.10
Downloading Python-2.7.10.tar.xz...
-> https://www.python.org/ftp/python/2.7.10/Python-2.7.10.tar.xz
Installing Python-2.7.10...
patching file ./Lib/site.py
Installed Python-2.7.10 to /home/kongxx/.pyenv/versions/2.7.10

$ pyenv install 3.2.1
...

$ pyenv versions
* system (set by /home/kongxx/.pyenv/version)
 2.7.10
 3.2.1

$ pyenv global 3.2.1
$ python -V
Python 3.2.1

$ pyenv version
3.2.1 (set by /home/kongxx/.pyenv/version)

$ pyenv versions
 system
 2.7.10
* 3.2.1 (set by /home/kongxx/.pyenv/version)

$ pyenv virtualenv 3.2.1 myenv

$ pyenv versions
 system
 2.7.10
* 3.2.1 (set by /home/kongxx/.pyenv/version)
 3.2.1/envs/myenv
 myenv

$ pyenv activate myenv

$ pyenv versions
 system
 2.7.10
 3.2.1
 3.2.1/envs/myenv
* myenv (set by PYENV_VERSION environment variable)

$ pyenv deactivate

$ pyenv virtualenv-delete myenv