ubuntu16.04升级python3.5到3.6

1）从python官网下载相应的版本https://www.python.org/downloads/source/

2）解压安装包：tar xf Python-3.6.8.tar.xz

3）cd Python-3.6.8
      ./configure --disable-shared --enable-loadable-sqlite-extensions
      make
      sudo make install