Unable to set default python version to python3 in ubuntu

Question

I was trying to set default python version to python3 in Ubuntu 16.04. By default it is python2 (2.7). I followed below steps :

Answer 1

Do

cd ~
gedit .bash_aliases

then write either

alias python=python3

or

alias python='/usr/bin/python3'

Save the file, close the terminal and open it again.
You should be fine now! Link