Changes

| style="border: 2px solid black;"| Using Classes| style="border: 2px solid black;| [https://docs.python.org/3/tutorial/classes.html Classes]|- style="background-color:white;border:none;"| style="border: 2px solid black;"| Python Scope| style="border: 2px solid black;| [https://www.saltycrane.com/blog/2008/01/python-variable-scope-notes/ Notes on Python Variable Scope]