centos 安装python3

1 yum安装

yum update && yum install python3 -y

2 从源码安装

参考了https://zhuanlan.zhihu.com/p/50171379

a 安装开发工具

yum install make automake gcc gcc-c++ kernel-devel
或
yum groupinstall "Development Tools" "Development Libraries"

b 安装依赖

yum install ffi-devel
yum install openssl-devel

c 下载源码

wget https://www.python.org/ftp/python/3.8.2/Python-3.8.2.tgz

d 解压源码

gunzip Python-3.8.2.tgz && tar -xvf Python-3.8.2.tar

e 配置编译安装

./configure -prefix=/usr/bin/ --enable-optimizations
make altinstall

3 yum基于python2 

做了软链接之后yum会报错

修改yum解释器

 vi /usr/bin/yum 
#!/usr/bin/python2

vi /usr/libexec/urlgrabber-ext-down

#!/usr/bin/python2