centos 升级　python

1. 下载python 2.7编译安装

$wget http://www.python.org/ftp/python/2.7.3/Python-2.7.3.tgz
$tar zxvf Python-2.7.3.tgz
$cd Python-2.7.3
$./configure
$make && make install

2.　然后安装python-setuptools 到pypi网站下载python-setuptools,版本要和yum的时候版本一致，不然运行的时候会出错

$wget http://pypi.python.org/packages/source/s/setuptools/setuptools-0.6c5.tar.gz
$tar zxvf setuptools-0.6c5.tar.gz
$cd setuptools-0.6c5
$python setup.py install

3.　装完setuptools 就可以安装　virtualenv

easy_install virtualenv

4. 建环境，

mkdir mypyenv
virtualenv mypyenv
cd mypyenv
source bin/activate

python -V

# 退出环境
deactivate