原文是：https://www.cnblogs.com/Sargreis/p/6921379.html
首先去官网下载python3.6
https://www.python.org/
环境准备：yum install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel
mkdir /usr/local/python3
准备安装python
./configure --prefix=/usr/local/python3 --enable-optimizations
make
makeinstall
ln -s /usr/local/python3/bin/python3.6 /usr/bin/python3
ln -s /usr/local/python3/bin/pip /usr/bin/pip3
cd /usr/bin
mv python python.bak
mv python3 python
在etc/profile最后一行中加入变量
export PATH="$PATH:/usr/local/python3/bin"
输入python -V 可以看到版本号
输入pip -V 可以看到新的位置
如果yum 安装报错 File "/usr/bin/yum", line 30 except KeyboardInterrupt, e:
因为yum包使用python2*等开发，修该为环境修改python3之后有问题，
解决：
修改文件/usr/bin/yum、/usr/libexec/urlgrabber-ext-down头中相应python为#!/usr/bin/python2.7
