Install pyenv from Homebrew, install Python from pyenv

Introduce pyenv, which allows version control calls before installing Python.

$ brew install pyenv

The related packages, autoconf and pkg-config, are also installed.

$ brew install pyenv
==> Installing dependencies for pyenv: autoconf, pkg-config
==> Installing pyenv dependency: autoconf
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/autoconf-2.
Already downloaded: /Library/Caches/Homebrew/autoconf-2.69.yosemite.bottle.1.tar.gz
==> Pouring autoconf-2.69.yosemite.bottle.1.tar.gz
?  /usr/local/Cellar/autoconf/2.69: 70 files, 3.1M
==> Installing pyenv dependency: pkg-config
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/pkg-config-
Already downloaded: /Library/Caches/Homebrew/pkg-config-0.28.yosemite.bottle.2.tar.gz
==> Pouring pkg-config-0.28.yosemite.bottle.2.tar.gz
?  /usr/local/Cellar/pkg-config/0.28: 10 files, 612K
==> Installing pyenv
==> Downloading https://github.com/yyuu/pyenv/archive/v20141211.tar.gz
######################################################################## 100.0%
==> Caveats
To enable shims and autocompletion add to your profile:
  if which pyenv > /dev/null; then eval "$(pyenv init -)"; fi

To use Homebrew's directories rather than ~/.pyenv add to your profile:
  export PYENV_ROOT=/usr/local/opt/pyenv
==> Summary
?  /usr/local/Cellar/pyenv/20141211: 315 files, 2.7M, built in 4 seconds
$ 

Create ~ / .pyenv directory ~ / .bash_profile change

.bash_profile

export PYENV_ROOT=/usr/local/opt/pyenv
eval "$(pyenv init -)"

Check what can be installed

$ pyenv install -l
Available versions:
  2.1.3
  2.2.3
  2.3.7
  2.4
  2.4.1
  2.4.2
  2.4.3
  2.4.4
  2.4.5
  2.4.6
  2.5
  2.5.1
  2.5.2
  2.5.3
  2.5.4
  2.5.5
  2.5.6
  2.6.6
  2.6.7
  2.6.8
  2.6.9
  2.7-dev
  2.7
  2.7.1
  2.7.2
  2.7.3
  2.7.4
  2.7.5
  2.7.6
  2.7.7
  2.7.8
  2.7.9

···abridgement···

This time, install the latest version 2.7.9 of 2 series

$ pyenv install 2.7.9

Related ones will also be installed.

$ pyenv install 2.7.9
Downloading readline-6.3.tar.gz...
-> http://ftpmirror.gnu.org/readline/readline-6.3.tar.gz
Installing readline-6.3...
Installed readline-6.3 to /usr/local/opt/pyenv/versions/2.7.9

Downloading Python-2.7.9.tgz...
-> https://www.python.org/ftp/python/2.7.9/Python-2.7.9.tgz
Installing Python-2.7.9...
Installing setuptools from https://bootstrap.pypa.io/ez_setup.py...
Installing pip from https://bootstrap.pypa.io/get-pip.py...
Installed Python-2.7.9 to /usr/local/opt/pyenv/versions/2.7.9

$

Installation confirmation

$ pyenv versions
* system (set by /usr/local/opt/pyenv/version)
  2.7.9
$ python --version
Python 2.7.6
$