1.为什么Linux装了python3后yum命令使用不了了？

centos系统的yum软件依赖python2，所以安装python3后需要建一个指向python3的软链，而不是将原先的python2的软链替换。

2.Linux中安装python3时make命令报错咋办？

python3对环境是有依赖的，yum安装一下环境依赖

# 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