set python3 as default code example

Example 1: update link python is python 3

$ python --version
Python 2.7.6
$ python3 --version
Python 3.4.3
$ alias python=python3
$ python --version
Python 3.4.3

Example 2: set python 3 as default ubuntu

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

Example 3: how to set default python version in macos

ln -s -f /usr/local/bin/python3.7 /usr/local/bin/python

Example 4: set python 3 as default ubuntu

sudo update-alternatives --config python

Example 5: which python mac

$ brew update && brew upgrade python

Example 6: update link python is python 3

$ \python --version 
Python 2.7.6