I created my bank user with name and balance, functions to deposit, withdraw and check balance, in the main, i ask for the name, what the user wants to do, check for ValueError, and in case the user wants the receipt, i call the function createReceipt from another python file, and create a txt file where the information is written. A lot of improvements will be made in the future, like sanitizing the input, using a database to load previous users and their data, and maybe a web app for it.