CentOS默认情况下系统已经安装了Python2，本机版本为 Python2.7.5。

    更新依赖环境
    yum -y install zlib zlib-devel
    yum -y install bzip2 bzip2-devel
    yum -y install ncurses ncurses-devel
    yum -y install readline readline-devel
    yum -y install openssl openssl-devel
    yum -y install openssl-static
    yum -y install xz lzma xz-devel
    yum -y install sqlite sqlite-devel
    yum -y install gdbm gdbm-devel
    yum -y install tk tk-devel
    yum -y install libffi libffi-devel

    1.下载python包
    wget https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tar.xz
    2.解压
    tar Jxvf Python-3.6.8.tar.xz
    3.移动位置
    mv Python-3.6.8 /usr/local/system_config/
    4.切换目录
    cd /usr/local/system_config/Python-3.6.8
    5.检测安装平台的目标特征
    ./configure —prefix=/usr/soft/python
    6.编译并安装
    make && make install
    7.建立软连接
    ln -s /usr/soft/python/bin/python3.6 /usr/bin/python3
    8.升级pip
    pip install —upgrade pip
    9.测试
    输入 python3