[PYTHON] Try using virtualenv now

I looked at pypy, but if you think about it, you can change python just by changing environment variables. I thought about it now, so I installed it

Appropriate in order or proportion. As a prerequisite, XCode, HomeBrew and pip are already installed.

First pypy installation

$ pip install pypy

Then install virtualenv

$ sudo pip install virtualenv
Password:
Downloading/unpacking virtualenv
  Downloading virtualenv-1.9.1.tar.gz (2.0MB): 2.0MB downloaded
  Running setup.py egg_info for package virtualenv

    warning: no previously-included files matching '*' found under directory 'docs/_templates'
    warning: no previously-included files matching '*' found under directory 'docs/_build'
Installing collected packages: virtualenv
  Running setup.py install for virtualenv

    warning: no previously-included files matching '*' found under directory 'docs/_templates'
    warning: no previously-included files matching '*' found under directory 'docs/_build'
    Installing virtualenv script to /usr/local/bin
    Installing virtualenv-2.7 script to /usr/local/bin
Successfully installed virtualenv
Cleaning up...

After that, collect the existing Python and set the environment

$ virtualenv -p `which pypy` pypy
Running virtualenv with interpreter /usr/local/bin/pypy
New pypy executable in pypy/bin/pypy
Installing setuptools............done.
Installing pip...............done.

$ virtualenv -p `which python` python_2_7_1
Running virtualenv with interpreter /usr/bin/python2.7
New python executable in python_2_7_1/bin/python
Installing setuptools............done.
Installing pip...............done.

$ virtualenv -p `which python2.6` python_2_6_7
Running virtualenv with interpreter /usr/bin/python2.6
New python executable in python_2_6_7/bin/python2.6
Also creating executable in python_2_6_7/bin/python
Installing setuptools............................done.
Installing pip...............done.

So, change the python to be executed at the end.

[yasui@yasui-MBA: ~][13:23] $ source ~/pypy/bin/activate
(pypy)[yasui@yasui-MBA: ~][13:23] $ python -V
Python 2.7.2 (341e1e3821ff, Jun 07 2012, 15:42:54)
[PyPy 1.9.0 with GCC 4.2.1]
(pypy)[yasui@yasui-MBA: ~][13:24] $

(pypy)[yasui@yasui-MBA: ~][13:24] $ source ~/python_2_7_1/bin/activate
(python_2_7_1)[yasui@yasui-MBA: ~][13:24] $ python -V
Python 2.7.1
(python_2_7_1)[yasui@yasui-MBA: ~][13:24] $

(python_2_7_1)[yasui@yasui-MBA: ~][13:24] $ source ~/python_2_6_7/bin/activate
(python_2_6_7)[yasui@yasui-MBA: ~][13:26] $ python -V
Python 2.6.7
(python_2_6_7)[yasui@yasui-MBA: ~][13:26] $