002 python.org
https://www.python.org/

003 Repl.it
https://repl.it/

003 Glot.io
https://glot.io/

006 The-Story-of-Python
https://www.youtube.com/watch?v=J0Aq44Pze-w

006 Python-2-vs-Python-3
https://sebastianraschka.com/Articles/2014_python_2_3_key_diff.html

006 Python-2-vs-Python-3-another-one
https://www.geeksforgeeks.org/important-differences-between-python-2-x-and-python-3-x-with-examples/