安装过程中出现这样那样的错误，终于摸索出来成功安装的方法。
所以在这里，把成功安装的过程记录在下面，以供参考：
安装准备：（cnetos安装python3.6 也可以参考）
yum -y install wget yum -y install setup yum -y install perl yum install openssl-devel -y yum install zlib-devel -y
安装：
yum -y groupinstall "Development tools" 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 yum install -y libffi-devel zlib1g-dev yum install zlib* -y yum install libffi-devel -y wget https://www.python.org/ftp/python/3.8.1/Python-3.8.1.tar.xz tar -xvJf Python-3.8.1.tar.xz mkdir /usr/local/python3 cd Python-3.8.1 ./configure --prefix=/usr/local/python3 --enable-optimizations --with-ssl make && make install ln -s /usr/local/python3/bin/python3 /usr/local/bin/python3 ln -s /usr/local/python3/bin/pip3 /usr/local/bin/pip3 pip3 install --upgrade pip
期间遇见安装“pip3 install –upgrade pip”时提示SSL问题：
rpm -aq|grep openssl yum install openssl-devel -y
然后再重新配适
./configure --prefix=/usr/local/python3 --enable-optimizations --with-ssl make && make install