1.下载python3.6.1的包
wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz
2.解压
tar -zxvf Python-3.6.1.tgz
进入Python-3.6.1目录 输入./configure
make
make install
*** 此时报错：zipimport.ZipImportError: can't decompress data; zlib not available
*** 解决问题：yum install zlib zlib-devel -y
*** 其他方法（未验证）：https://github.com/pyenv/pyenv/wiki/Common-build-problems
3.修改系统默认的版本
python --version 还是2.7.5
mv /usr/bin/python /usr/bin/python27
ln -s /usr/local/bin/python3.6 /usr/bin/python