CentOS 7下安装Python3.6
1）安装python3.6可能使用的依赖
yum -y install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel
2）到python官网找到下载路径, 用wget下载
wget https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tgz
3）解压tgz包
tar zxvf Python-3.6.4.tgz
4）把python移到/usr/local下面
mv Python-3.6.4 /usr/local/python
5）删除旧版本的python依赖
ll /usr/bin | grep python
rm -rf /usr/bin/python
6）进入python目录
cd /usr/local/python
7）配置
./configure
8）编译，安装
make && make install
9）删除旧的软链接，创建新的软链接到最新的python
rm -rf /usr/bin/python
rm -rf /usr/bin/python2
ln -s /usr/local/bin/python3.6 /usr/bin/python
vim /usr/bin/yum
将#!/usr/bin/python
改为：
#!/usr/bin/python2
vim /usr/libexec/urlgrabber-ext-down
将#!/usr/bin/python
改为：
#!/usr/bin/python2
python -V