Thie repository is exist to study python3 for me. The souce codes in this repository is refer to below: “Introducing Python by Bill Lubanovic (O’Reilly). Copyright 2015 Bill Lubanovic, 978-1-449-35936-2.”
I think that answer code by myself is permitted to open since the permission of using code examples is given by author in the book.
If you feel I use of code examples falls outside fair use, contact me by Issue etc.