Ubuntu16.04怎样安装Python3.6

Ubuntu16.04默认安装了Python2.7和3.5

请注意，系统自带的python千万不能卸载！

输入命令python

按Ctrl+D退出python命令行

输入命令sudo add-apt-repository ppa:jonathonf/python-3.6

按Enter确认

输入命令sudo apt-get update

输入命令sudo apt-get install python3.6

按Y确认

 

调整Python3的优先级，使得3.6优先级较高

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.5 1

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 2

更改默认值，python默认为Python2，现在修改为Python3

sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 100

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 150

 

此时再输入命令python

可以看到此时已经是Python3.6了

 

sudo add-apt-repository ppa:jonathonf/python-3.6命令会导致报错，提示Cannot add PPA: 'ppa:~jonathonf/ubuntu/python-3.6'.
The user named '~jonathonf' has no PPA named 'ubuntu/python-3.6'

需更改成：sudo add-apt-repository ppa:deadsnakes/ppa