Centos 7 默认安装的python版本为2.7，自己学习需要安装了个3.5的
1、安装依赖
1 yum install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel wget
2、下载3.5的源码包
1 wget "https://www.python.org/ftp/python/3.5.0/Python-3.5.0.tgz"
3、解压
1 tar -zxvf Python-3.5.0.tgz
4、编译
1 mkdir /usr/local/python3
2 Python-3.5.0/configure --prefix=/usr/local/python3
3 make && make install
5、备份2.7，链接3.5
1 mv /usr/bin/python /usr/bin/python.bak
2 ln -s /usr/local/python3/bin/python3 /usr/bin/python
6、修改yun配置文件
1 vim /usr/bin/yum
2 将第一行指定的python版本改为python2.7(#!/usr/bin/python 改为 #!/usr/bin/python2.7)