- https://docs.python.org/3/glossary.html#term-special-method - https://www.w3schools.com/python/python_oop.asp - https://github.com/ObrienlabsDev/blog/issues/159 - live https://colab.research.google.com/drive/1C9epnQRwIf-OCr-sWo8xicBcT2rmMcTC#scrollTo=DHGlz9WGQWbk
