Python安装
1.下载Python2.7源安装包：
wgethttps://www.python.org/ftp/python/2.7.12/Python-2.7.12.tar.xz
2.解压安装包：
tar -zxvf Python-2.7.12.tar.xz
3.切换至python目录下
cd Python-2.7.12/
4.安装readline-devel包
yum install readline-devel
5.使用configure创建makefile
./configure --prefix=/usr/local/python27
make && make install
6.将Python2.7程序通过软连接到/usr/bin/Python2.7环境变量中
ln -sv /usr/local/python27/bin/python2.7 /usr/bin/python2.7
