my python code is not working not sure why 

# Library Project
import datetime
import uuid


class LibrarySystem:
    def __init__(self, list_of_books, library_name):
        self.list_of_books = list_of_books
        self.list_of_books = "list_of_books.txt"
        self.library_name = library_name
        self.books_dict = {}
        with open(self.list_of_books) as bk:
            content = bk.readlines()
            for line in content:
                books_title, author, category = line.strip().split(",")
                book_id = str(uuid.uuid4())  # generate a unique ID
                self.books_dict.update({book_id: {"book_title": books_title, "author": author, "category": category,
                                                  "quantity": 5, "availability": "yes"}})

    def display_books(self):
        print("-----------------------------------List Of Books----------------------------")
        print("Book ID", "t", "Title", "ttt", "Author", "tt", "Category", "tt", "Quantity", "t",
              "Availability")
        print("----------------------------------------------------------------------------")
        for key, value in self.books_dict.items():
            print(key, "tt", value.get("book_title"), "tt", value.get("author"), "t", value.get("category"),
                  "tt", value.get("quantity"), "tt", value.get("availability"))

    def rent_books(self):
        rented_books = []
        while True:
            search_criteria = input("Enter book ID, title, author, or category to search for a book (q to quit): ")
            if search_criteria == 'q':
                break
            found_books = []
            for book_id, book_info in self.books_dict.items():
                if search_criteria.lower() in book_info['book_title'].lower() or search_criteria.lower() in book_info[
                    'author'].lower() or search_criteria.lower() in
                        book_info['category'].lower() or search_criteria == book_id:
                    found_books.append((book_id, book_info))
            if not found_books:
                print(f"No books found for '{search_criteria}'")
            else:
                print("Found books:")
                print("Book ID", "t", "Title", "ttt", "Author", "tt", "Category", "tt", "Quantity", "t",
                      "Availability")
                print("----------------------------------------------------------------------------")
                for book_id, book_info in found_books:
                    print(book_id, "tt", book_info['book_title'], "tt", book_info['author'], "t",
                          book_info['category'], "tt", book_info['quantity'], "tt", book_info['availability'])
                book_id = input("Enter the book ID to rent (q to quit): ")
                if book_id == 'q':
                    break
                elif book_id not in self.books_dict.keys():
                    print("Invalid book ID. Please enter a valid book ID.")
                elif self.books_dict[book_id]['availability'] == 'no':
                    print("This book is currently not available. Please choose another book or try again later.")
                elif int(self.books_dict[book_id]['quantity']) == 0:
                    print(
                        "Sorry, all copies of this book have been rented out."
                        " Please choose another book or try again later.")
                else:
                    lender_name = input("Enter your name: ")
                    issue_date = datetime.date.today()
                    self.books_dict[book_id]['lender_name'] = lender_name
                    self.books_dict[book_id]['issue_date'] = issue_date
                    self.books_dict[book_id]['quantity'] = str(int(self.books_dict[book_id]['quantity']) - 1)
                    if int(self.books_dict[book_id]['quantity']) == 0:
                        self.books_dict[book_id]['availability'] = 'no'
                    rented_books.append(self.books_dict[book_id]['book_title'])
                    print(
                        f"Congratulations! You have rented the book '"
                        f"{self.books_dict[book_id]['book_title']}' successfully !!!")
                    another_rental = input("Do you want to rent another book? (y/n) : ")
                    if another_rental.lower() == 'n':
                        self.print_receipt(rented_books)
                        break

    def add_books(self):
        books_title = input("Enter Book Title : ")
        author = input("Enter Author Name : ")
        category = input("Enter Book Category : ")
        quantity = input("Enter Book Quantity : ")
        if books_title == "" or author == "" or category == "" or quantity == "":
            print("Please enter valid input for book title, author, category and quantity!!!")
            return self.add_books()
        else:
            with open(self.list_of_books, "a") as b:
                b.writelines(f"{books_title},{author},{category}")
            book_id = str(uuid.uuid4())  # generate a unique ID
            self.books_dict.update({book_id: {"book_title": books_title, "author": author,
                                              "category": category, "quantity": quantity, "availability": "yes"}})
            print(f"The book '{books_title}' has been added successfully !!!")

    def return_books(self):
        while True:
            book_id = input("Enter the book ID to return (6 to quit): ")
            if book_id == '6':
                break
            elif book_id not in self.books_dict.keys():
                print("Invalid book ID. Please enter a valid book ID.")
            elif self.books_dict[book_id]['availability'] == 'yes':
                print("This book is not currently rented. Please enter a valid book ID.")
            else:
                lender_name = self.books_dict[book_id]['lender_name']
                issue_date = self.books_dict[book_id]['issue_date']
                due_date = issue_date + datetime.timedelta(days=30)
                return_date = datetime.date.today()
                days_late = (return_date - due_date).days if return_date > due_date else 0
                late_fee = days_late * 0.10
                self.books_dict[book_id]['lender_name'] = ''
                self.books_dict[book_id]['issue_date'] = ''
                self.books_dict[book_id]['quantity'] = str(int(self.books_dict[book_id]['quantity']) + 1)
                self.books_dict[book_id]['availability'] = 'yes'
                print(f"Thank you for returning the book '{self.books_dict[book_id]['book_title']}'")
                print("Lender Name: ", lender_name)
                print("Issue Date: ", issue_date.strftime("%Y-%m-%d"))
                print("Due Date: ", due_date.strftime("%Y-%m-%d"))
                print("Return Date: ", return_date.strftime("%Y-%m-%d"))
                print("Days Late: ", days_late)
                print("Late Fee: $", late_fee)
                return_option = input("Do you want to return another book? (y/n): ")
                if return_option.lower() == 'n':
                    break

    def search_books(self):
        while True:
            search_criteria = input("Enter a book title, author, or category to search for a book (q to quit): ")
            if search_criteria == 'q':
                break
            found_books = []
            for book_id, book_info in self.books_dict.items():
                if search_criteria.lower() in book_info['book_title'].lower() or search_criteria.lower() in
                        book_info['author'].lower() or search_criteria.lower() in book_info['category'].lower():
                    found_books.append((book_id, book_info))
            if not found_books:
                print(f"No books found for '{search_criteria}'")
            else:
                print("Found books :")
                print(" Book ID", "t", "Title", "ttt", "Author", "tt", "Category", "tt", "Quantity", "t",
                      "Availability")
                print("----------------------------------------------------------------------------")
                for book_id, book_info in found_books:
                    print(book_id, "tt", book_info['book_title'], "tt", book_info['author'], "t",
                          book_info['category'], "tt", book_info['quantity'], "tt", book_info['availability'])
                rent_option = input("Do you want to rent a book? (y/n): ")
                if rent_option.lower() == 'y':
                    book_id = input("Enter the book ID to rent: ")
                    if book_id in self.books_dict.keys() and self.books_dict[book_id]['availability'] == 'yes':
                        lender_name = input("Please Enter your name: ")
                        issue_date = datetime.date.today()
                        self.books_dict[book_id]['lender_name'] = lender_name
                        self.books_dict[book_id]['issue_date'] = issue_date
                        self.books_dict[book_id]['quantity'] = str(int(self.books_dict[book_id]['quantity']) - 1)
                        if self.books_dict[book_id]['quantity'] == '0':
                            self.books_dict[book_id]['availability'] = 'no'
                        print(
                            f"Congratulations! You have rented the book '{self.books_dict[book_id]['book_title']}' "
                            f"successfully !!!")
                        return
                    else:
                        print("Invalid book ID or the book is not available for rent. Please enter a valid book ID.")
                else:
                    return

    def print_receipt(self, rented_books):
        print("--------------------- Receipt ---------------------")
        print("Book Title", "ttt", "Return Due Date")
        print("---------------------------------------------------")
        due_date = datetime.date.today() + datetime.timedelta(days=30)
        for book_title in rented_books:
            print(book_title, "ttt", due_date.strftime("%Y-%m-%d"))
        print("---------------------------------------------------")


if __name__ == "__main__":
    try:
        mylms = LibrarySystem("list_of_books.txt", "Python's")
        press_key_list = {"1": "Display Books", "2": "Rent Books", "3": "Donate Books", "4": "Return Books",
                          "5": "Search Books", "6": "Exit"}

        key_press = False
        while not (key_press == "6"):
            print(f"-------------Welcome TO {mylms.library_name}'s Library System---------------")
            for key, value in press_key_list.items():
                print("Press", key, "To", value)
            key_press = input("Press Key : ").lower()
            if key_press == "1":
                print("Current Selection : Display Books")
                mylms.display_books()

            elif key_press == "2":
                print("Current Selection : Rent Books")
                mylms.rent_books()

            elif key_press == "3":
                print("Current Selection :   Donate Books")
                mylms.add_books()

            elif key_press == "4":
                print("Current Selection : Return Books")
                mylms.rent_books()

            elif key_press == "5":
                print("Current Selection : Search Books")
                mylms.search_books()

            elif key_press == "6":
                break
            else:
                continue

    except Exception:
        print("Something went wrong. Please check again !!!!!")