# 切换aliyun
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
cd /etc/yum.repos.d/
# centos6.x
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

# centos7.x
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

yum clean all
yum makecache
yum install tree -y
yum update -y

yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make libffi-devel

#安装Python3.7.0，依次执行下列代码即可
wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz
tar -zxvf Python-3.7.0.tgz
cd Python-3.7.0
./configure --with-ssl

make&&make install

mv /usr/bin/python /usr/bin/python26
ln -s /usr/local/bin/python3 /usr/bin/python
mv /usr/bin/pip /usr/bin/pip26
ln -s /usr/local/bin/pip3 /usr/bin/pip


# 修改 /usr/bin/yum
vim /usr/bin/yum
#!/usr/bin/python
改为:
#!/usr/bin/python26