安装python
（1）官网下载安装包
（2）解压安装包
(3)安装过程需要解决安装的依赖性
yum install -y gcc zlib zlib-devel openssl-devel readline readline-devel
(4)-安装：make && make install (安装目录在/usr/local/python)
/usr/local/python/bin/系统python的路径
软链接：
ln -s /usr/local/python/bin/python3.6 /usr/local/bin/
ln -s /usr/local/python/bin/pip3.6 /usr/local/bin/
#测试是否安装成功
python3.6