Python vs Python3

I was confused because when I type python --version in terminal, it returned Python 2.7.10 but I used python3 for django.
After research, I realized that mutliple versions of Python can be installed and exist simultaneously. And the symbolic link for python on my computer was directed to Python 2.7.10, which is why when I had to type python3 instead of python in order to use the latest Python. So I installed newest python by Homebrew

brew install python

set symlink from python to python3

ls -l -f /usr/local/bin/python3 /usr/local/bin/python

assigned the command 'python' to 'python3'

alias python=python3