1、python3我之前安装过了，在usr/bin里面搜索‘python’可以找到python3.4，如果非要使用python3.4，则可以
echo@echo-PC:~$python3Python 3.4.0 (default, Apr 11 2014, 13:05:11)[GCC 4.8.2] on linuxType "help", "copyright", "credits" or "license" for more information.>>>