Difference between Python 2 and Python 3

Python 2 It was started in 2000. In 2010 they launched Python 2.7 The support/update for Python 2 will end soon. The security update may stopped during 2020

Python 3 It was first release around 2008. Division operator works differently in Python3.

Here are some more details http://sebastianraschka.com/Articles/2014_python_2_3_key_diff.html

Jupiter Notebook Reference http://nbviewer.jupyter.org/github/jmportilla/Complete-Python-Bootcamp/tree/master/

Here is nice website which will tell us the library using Python 3 http://py3readiness.org/