Ubuntu 18.04에서 python dual로 세팅하기

unix.stackexchange.com/questions/410579/change-the-python3-default-version-in-ubuntu

Change the Python3 default version in Ubuntu

관련 포스팅.

 

1번 답변 (246 upvote): 

 

From the comment:

 

sudo update-alternatives --config python

Will show you an error:

update-alternatives: error: no alternatives for python3

You need to update your update-alternatives , then you will be able to set your default python version.

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.4 1 
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.6 2

Then run :

sudo update-alternatives --config python

Set python3.6 as default.

Or use the following command to set python3.6 as default:

sudo update-alternatives --set python /usr/bin/python3.6

 

 

2번 답변 : (37 upvote)

 

You can achieve this by applying below simple steps -

1. Check python version on terminal - python --version
2. Get root user privileges. On terminal type - sudo su
3. Write down the root user password
4. Execute this command to switch to python 3.6 -
   update-alternatives --install /usr/bin/python python /usr/bin/python3 1
5. Check python version - python --version
6. Done.