1、CentOS安装Python的依赖包
yum groupinstall "Development tools"
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel
2、下载Python3.4的源码包并编译
wget https://www.python.org/ftp/python/3.4.1/Python-3.4.1.tgz
tar xf Python-3.4.1.tgz
cd Python-3.4.1
./configure --prefix=/usr/local --enable-shared
make
make install
3、在运行Python之前需要配置库：
echo /usr/local/lib >> /etc/ld.so.conf.d/local.conf
ldconfig
4、运行演示：
python3 --version
Python 3.4.1
5、删除编译Python时所需要的库
yum groupremove "Development tools" --remove-leaves
yum remove zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel --remove-leaves
6、建立软连接，使系统默认的 python指向 python3.4
mv /usr/bin/python /usr/bin/python2.6.6
ln -s /usr/local/bin/python3.4 /usr/bin/python
参考：http://www.linuxidc.com/Linux/2015-01/111870.htm