The balance or percentage must be integer, I added "try except blocks" but if the client inserts an float or string, how can i start over again to ask.By the way, is there any efficent way than "try except" ?

You should probably implement a while loop just so the user is able to keep on using the program multiple times. It would also be cool to add the ability to make an account and a login system using the "Account" class you made, which seems like something you are planning to implement. This project has some potential for personal use, keep it up!

Cool! I found an error. If you try to enter a letter it shows invalid int error.