Centos7 安装python3.8
# 安装编译依赖包
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 libffi-devel
# 下载python3.8
wget https://www.python.org/ftp/python/3.8.3/Python-3.8.3.tgz
tar -zxvf Python-3.8.3.tgz
# 创建编译安装目录
mkdir /usr/local/python3
# 编译python3
cd Python-3.8.3
./configure --prefix=/usr/local/python3
make && make install
# 现在python3已经编译好了，因为centos7默认安装了python2.7，所以要有如下修改
# 查看当前python软连接
ll /usr/bin/ |grep python
lrwxrwxrwx. 1 root root 7 8月 5 09:29 python -> python2
lrwxrwxrwx. 1 root root 9 8月 5 09:29 python2 -> python2.7
-rwxr-xr-x. 1 root root 7144 11月 17 2020 python2.7
# 删除python软连接，并创建python3软连接
rm -rf /usr/bin/python
ln -s /usr/local/python3/bin/python3 /usr/bin/python
python -V
Python 3.8.3
# 删除默认pip软连接，并添加pip3新的软连接
rm -rf /usr/bin/pip
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip
# 更改yum配置，因为yum修改用python2才能执行，所以有如下修改
vim /usr/bin/yum
# 把 #! /usr/bin/python 修改为 #! /usr/bin/python2
vim /usr/libexec/urlgrabber-ext-down
# 把 #! /usr/bin/python 修改为 #! /usr/bin/python2
vim /usr/bin/yum-config-manager
# 把 #! /usr/bin/python 改为 #!/usr/bin/python2
