安装编译工具
yum -y groupinstall "Development tools"
yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel
yum install libffi-devel -y
下载python源码，并解压
wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tar.xz
tar -xvJf Python-3.7.0.tar.xz
编译
mkdir /usr/local/python3
cd Python-3.7.0
./configure --prefix=/usr/local/python3
make && make install
创建软连接
ln -s /usr/local/python3/bin/python3 /usr/local/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/local/bin/pip3
验证是否成功
python3 -V
pip3 -V
Python2和Python3共存
1.查看当前python版本
python -V
Python 2.6.6
2.备份当前python版本
mv /usr/bin/python /usr/bin/python2.6.6
3.简历python软连接
which python3
/usr/local/bin/python3
ln -s /usr/local/bin/python3 /usr/bin/python
4.校验版本
python -V
Python 3.7.0
5.修改yum
vi /usr/bin/yum #将文件头部的#!/usr/bin/python 改成#!/usr/bin/python2.6.6