Ubuntu16.04自带的python版本为python2.7和python3.5，现在想要安装python3.6.4
官网下载安装包http://www.python.org/ftp/python/3.6.4/Python-3.6.4.tgz
解压tar -xvzf Python-3.6.4.tgz安装
cd Python-3.6.4 ./configure --with-ssl编译
sudo make sudo make install查看python3.6.4的安装路径
which python3 # /usr/local/bin/python3设置3.6为默认版本
sudo update-alternatives --install /usr/bin/python python /usr/local/bin/python3 150
##查看python版本
$ python -V Python 3.6.4
