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Python3.5的源码包并编译
wget https://www.python.org/ftp/python/3.5.0/Python-3.5.0.tgz
tar xf Python-3.5.0.tgz
cd Python-3.5.0
./configure --prefix=/usr/local --enable-shared
make
make install
ln –s /usr/local/bin/python3 /usr/bin/python3
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 3.5.0
5、删除编译Python时所需要的库
yum groupremove "Development tools" --remove-leaveas
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、设置别名方便使用
alias py=python3
7、CentOS 安装easy_install、pip的方法
CentOS 安装easy_install的方法：
wget -q http://peak.telecommunity.com/dist/ez_setup.py
python ez_setup.py
8、CentOS安装python包管理安装工具pip的方法如下：
wget --no-check-certificate https://github.com/pypa/pip/archive/1.5.5.tar.gz
注意：wget获取https的时候要加上：--no-check-certificate
tar zvxf 1.5.5 #解压文件 cd pip-1.5.5/ python3 setup.py install
OK，这样就安装好pip了，
下面来安装 requests吧。
pip3 install requests