依赖包安装：
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 gcc
下载包：
wget https://www.python.org/ftp/python/3.8.0/Python-3.8.0.tgz
解压：
tar -zxvf Python-3.8.0.tgz
安装：
cd Python-3.8.0
./configure --prefix=/usr/local/python3 && make && make install
建立python软连接
ln -s /usr/local/python3/bin/python3.8 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3.8 /usr/bin/pip3
验证
python3 -V & pip3 -V
安装virtualenv
pip3 install virtualenv
建立virtualenv软连接
ln -s /usr/local/python3/bin/virtualenv /usr/bin/virtualenv
完成
