CentOS下使用yum安装的python版本是2.6.6，若要安装3.3.0版本，需要下载源码http://python.org/ftp/python/3.3.0/Python-3.3.0.tgz
以root用户运行
./configure --prefix=/usr/local/python3
make
make install
安装IDLE开发环境
sudo yum install python-tools
IDLE can't import Tkinter. Your Python may not be configured for Tk. 错误解决
sudo yum install tk-devel tcl-devel
//重新编译安装python3.3.0
sudo rm /usr/local/python3 -rf
./configure --prefix=/usr/local/python3
make
make install
注意：每次编译安装python3后，都需要配置相关环境变量，执行source命令（临时方案）或者重启计算机，使环境变量生效，才能使用python3和idle3命令。