升级自带2.6.6版本到2.7.12
1.下载解压Python-2.7.12.tar.xz
xz -d Python-2.7.12.tar.xz
tar -xvf Python-2.7.12.tar2.必要时安装以下依赖，或根据编译情况解决依赖
yum -y update
yum -y groupinstall ‘development tools‘
yum -y install zlib-devel bzip2-devel openssl-devel xz-libs wget ncurses-devel3.安装Python
cd Python-2.7.12
./configure --prefix=/usr/local/python
make
make altinstall #altinstall可以避免安装时创建任何软连接4.建立连接
mv /usr/bin/python{,.old}
ln -s /usr/local/python/bin/python2.7 /usr/bin/python5.安装pip和setuptools
下载get-pip.py，在pypi里setuptools的安装文档中有下载链接
python get-pip.py
mv /usr/bin/pip{,.old}
ln -s /usr/local/python/bin/pip /usr/bin/pip
mv /usr/bin/easy_install{,.old}
ln -s /usr/local/python/bin/easy_install /usr/bin/easy_install6.修复yum，修改/usr/bin/yum
#!/usr/bin/python #修改前
#!/usr/bin/python.old #修改后EOF
