首先最好先换yum源，方便后续操作 换源方法 1，在usr文件夹里建立文件 (1)进入目录 cd /usr/local (2)创建文件夹 #mkdir python3 2，安装依赖包 yum install -y libffi-devel yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc libffi-devel 3，在home目录下建立文件 (1)进入目录 cd /home/python3 (2)创建文件夹 mkdir python3 (3)进入目录 cd python3 4，下载并安装python (1)下载 wget www.python.org/ftp/python/… (2)解压 tar -zvxf Python-3.7.3.tgz (3)进入解压后的目录 cd Python-3.7.3 (4)编译 ./configure --prefix=/usr/local/python3 (5)安装 make && make install 5，安装支持python的gcc，要不然python3无法运行 (1)下载gcc yum install make gcc gcc-c++ zlib* openssl* libffi-devel -y (2)执行 ./configure (3)安装 make && make install 6，备份python2 (1)将原来的python软链接指向python3 mv /usr/bin/python /usr/bin/python.bak (2)创建新的软连接 ln -s /usr/local/python/bin/python3.7 /usr/bin/python 7，yum备份 编辑这两个文件，将/usr/local/python改成/usr/local/python2 vim /usr/bin/yum vim /usr/libexec/urlgrabber-ext-down
