ubuntu下卸载 python2 只需要一条语句就可以实现:
sudo apt-get remove python
ubuntu下安装python3:sudo apt-get install python3
但这样只安装了python3.4,要想使用python3.5,则必须升级python3.4:1
2
3sudo add-apt-repository ppa:fkrull/deadsnakes
sudo apt-get update
sudo apt-get install python3.5
启动时
输入python时启动的是python2.7
输入python3时启动的是python3.4
输入python3.5时启动的才是python3.5