##下载yum源(Centos 7 为例)

[root@localhost ~]# wget http://mirror.centos.org/centos/7/extras/x86_64/Packages/epel-release-7-11.noarch.rpm

##安装yum源

[root@localhost ~]# yum install -y epel-release-7-11.noarch.rpm

##安装sl命令(小火车)

[root@localhost ~]# yum install -y sl

##安装ipython命令

[root@localhost ~]# yum install -y ipython