前几天我决定我希望命令python默认启动python3而不是python2.
所以我这样做了：
sudo update-alternatives --install /usr/bin/python python /usr/bin /python2.7 2
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.5 3
sudo update-alternatives –config python
$sudo update-alternatives --config python
There are 2 choices for the alternative python (providing /usr/bin/python).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/bin/python3.5 3 auto mode
1 /usr/bin/python2.7 2 manual mode
2 /usr/bin/python3.5 3 manual mode
Press <enter> to keep the current choice[*], or type selection number: 0
这一切都奏效了.大！
