Centos7.0升级python 2.x到3.x

1. 下载python source文件：wget https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tgz
2. 安装python依赖包：yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make
3. 重新配置yum
1. vi /usr/bin/yum
2. vi /usr/libexec/urlgrabber-ext-down