排序算法动画：http:https://sorting.at/
sudo cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
sudo wget -O /etc/yum.repos.d/CentOS-Base.repo http:https://mirrors.aliyun.com/repo/Centos-7.repo
sudo wget -P /etc/yum.repos.d/ http:https://mirrors.aliyun.com/repo/epel-7.repo
sudo yum clean all
sudo yum makecache
wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz
tar zxvf Python-3.6.1.tgz
cd Python-3.6.1
./configure --prefix=/usr/local/python3
make
make install
``