answer:Here's a Python implementation of the given requirements: ```python class Tire: def __init__(self, tire_brand, tire_size, tire_type): self.tire_brand = tire_brand self.tire_size = tire_size self.tire_type = tire_type def purchase_tire(self): print(fCongratulations, you have purchased a {self.tire_brand} {self.tire_size} {self.tire_type} tire.) def calculate_cost(self): pass # This method will be overridden in child classes class NewTire(Tire): def __init__(self, tire_brand, tire_size, tire_type, tire_color, tire_speed, tire_load, tire_tread, price): super().__init__(tire_brand, tire_size, tire_type) self.tire_color = tire_color self.tire_speed = tire_speed self.tire_load = tire_load self.tire_tread = tire_tread self.price = price def display_tire_details(self): print(fTire Brand: {self.tire_brand}) print(fTire Size: {self.tire_size}) print(fTire Type: {self.tire_type}) print(fTire Color: {self.tire_color}) print(fTire Speed: {self.tire_speed}) print(fTire Load: {self.tire_load}) print(fTire Tread: {self.tire_tread}) print(fPrice: {self.price}) def calculate_cost(self): return self.price class UsedTire(NewTire): def __init__(self, tire_brand, tire_size, tire_type, tire_color, tire_speed, tire_load, tire_tread, price, tire_condition, mileage): super().__init__(tire_brand, tire_size, tire_type, tire_color, tire_speed, tire_load, tire_tread, price) self.tire_condition = tire_condition self.mileage = mileage def calculate_used_price(self): used_price = self.price * (1 - (self.mileage / 100000)) # decrease price based on mileage return used_price def calculate_cost(self): return self.calculate_used_price() class TireRepair(NewTire): def __init__(self, tire_brand, tire_size, tire_type, tire_color, tire_speed, tire_load, tire_tread, price, tire_repair_type, parts_cost, labor_cost): super().__init__(tire_brand, tire_size, tire_type, tire_color, tire_speed, tire_load, tire_tread, price) self.tire_repair_type = tire_repair_type self.parts_cost = parts_cost self.labor_cost = labor_cost def calculate_repair_cost(self): return self.parts_cost + self.labor_cost def calculate_cost(self): return self.calculate_repair_cost() # Example usage new_tire = NewTire(Michelin, 225/60R17, All-season, Black, H, 98, Symmetrical, 150) new_tire.display_tire_details() new_tire.purchase_tire() print(fTotal cost: {new_tire.calculate_cost():.2f}) used_tire = UsedTire(Michelin, 225/60R17, All-season, Black, H, 98, Symmetrical, 150, Good, 50000) used_tire.display_tire_details() used_tire.purchase_tire() print(fTotal cost: {used_tire.calculate_cost():.2f}) tire_repair = TireRepair(Michelin, 225/60R17, All-season, Black, H, 98, Symmetrical, 150, Puncture repair, 20, 30) tire_repair.display_tire_details() tire_repair.purchase_tire() print(fTotal cost: {tire_repair.calculate_cost():.2f}) ``` In this code: * We create a base `Tire` class with attributes and methods, including a `calculate_cost` method that will be overridden in child classes for polymorphism. * The `NewTire` class inherits from `Tire` and adds its own attributes and methods, including `display_tire_details`. * The `UsedTire` class inherits from `NewTire` and adds attributes and methods specific to used tires, including `calculate_used_price`. * The `TireRepair` class also inherits from `NewTire` and adds attributes and methods related to tire repair, including `calculate_repair_cost`. * We demonstrate polymorphism by calling the `calculate_cost` method on instances of each class, which returns the total cost based on the specific type of tire or

answer:To implement polymorphism and calculate the total cost for all items on the list, you can modify the `calculate_cost` method in the `Tire` class to raise a `NotImplementedError`. Then, define the `calculate_total_cost` function to iterate through the list of `Tire` objects, call the `calculate_cost` method on each item, and sum the total cost. Here's the updated code: ```python class Tire: # ... def calculate_cost(self): raise NotImplementedError(Subclasses must implement the calculate_cost method) # ... (rest of the classes remain the same) def calculate_total_cost(tire_list): total_cost = 0 for tire in tire_list: total_cost += tire.calculate_cost() return total_cost # Example usage new_tire = NewTire(Michelin, 225/60R17, All-season, Black, H, 98, Symmetrical, 150) used_tire = UsedTire(Michelin, 225/60R17, All-season, Black, H, 98, Symmetrical, 150, Good, 50000) tire_repair = TireRepair(Michelin, 225/60R17, All-season, Black, H, 98, Symmetrical, 150, Puncture repair, 20, 30) tire_list = [new_tire, used_tire, tire_repair] for tire in tire_list: tire.display_tire_details() print(fTotal cost: {tire.calculate_cost():.2f}n) print(fTotal cost for all items on the list: {calculate_total_cost(tire_list):.2f}) ``` In this updated code: * The `calculate_cost` method in the `Tire` class raises a `NotImplementedError` to ensure that subclasses implement this method. * The `calculate_total_cost` function takes a list of `Tire` objects, iterates through the list, calls the `calculate_cost` method on each item, and returns the total cost. With these changes, you can create a list of `Tire` objects, iterate through the list, and calculate the total cost for each item using polymorphism. The `calculate_total_cost` function then calculates the total cost for all items on the list.

answer:Here is the updated code with all the requested features: tire_model.py: ```python import sqlite3 DB_NAME = tire.db class TireModel: def __init__(self): self.conn = sqlite3.connect(DB_NAME) self.cursor = self.conn.cursor() def create_table(self): query = CREATE TABLE IF NOT EXISTS tires ( id INTEGER PRIMARY KEY AUTOINCREMENT, tire_brand TEXT, tire_size TEXT, tire_type TEXT, tire_color TEXT, tire_speed TEXT, tire_load TEXT, tire_tread TEXT, price REAL, tire_condition TEXT, mileage INTEGER, tire_repair_type TEXT, parts_cost REAL, labor_cost REAL, total_cost REAL ); self.cursor.execute(query) self.conn.commit() def insert_tire(self, data): query = INSERT INTO tires ( tire_brand, tire_size, tire_type, tire_color, tire_speed, tire_load, tire_tread, price, tire_condition, mileage, tire_repair_type, parts_cost, labor_cost, total_cost ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?); self.cursor.execute(query, data) self.conn.commit() def get_all_tires(self): query = SELECT * FROM tires; self.cursor.execute(query) return self.cursor.fetchall() def delete_tire(self, id): query = DELETE FROM tires WHERE id = ?; self.cursor.execute(query, (id,)) self.conn.commit() ``` tire.py: ```python from tire_model import TireModel class Tire: def __init__(self, tire_brand, tire_size, tire_type): self.tire_brand = tire_brand self.tire_size = tire_size self.tire_type = tire_type def purchase_tire(self): print(fCongratulations, you have purchased a {self.tire_brand} {self.tire_size} {self.tire_type} tire.) def calculate_cost(self): raise NotImplementedError(Subclasses must implement the calculate_cost method) class NewTire(Tire): def __init__(self, tire_brand, tire_size, tire_type, tire_color, tire_speed, tire_load, tire_tread, price): super().__init__(tire_brand, tire_size, tire_type) self.tire_color = tire_color self.tire_speed = tire_speed self.tire_load = tire_load self.tire_tread = tire_tread self.price = price def display_tire_details(self): print(fTire Brand: {self.tire_brand}) print(fTire Size: {self.tire_size}) print(fTire Type: {self.tire_type}) print(fTire Color: {self.tire_color}) print(fTire Speed: {self.tire_speed}) print(fTire Load: {self.tire_load}) print(fTire Tread: {self.tire_tread}) print(fPrice: {self.price}) def calculate_cost(self): return self.price def save_to_database(self): model = TireModel() data = ( self.tire_brand, self.tire_size, self.tire_type, self.tire_color, self.tire_speed, self.tire_load, self.tire_tread, self.price, None, None, None, None, None, self.calculate_cost() ) model.insert_tire(data) class UsedTire(NewTire): def __init__(self, tire_brand, tire_size, tire_type, tire_color, tire_speed, tire_load, tire_tread, price, tire_condition, mileage): super().__init__(tire_brand, tire_size, tire_type, tire_color, tire_speed, tire_load, tire_tread, price) self.tire_condition = tire_condition self.mileage = mileage def calculate_used_price(self): used_price = self.price * (1 - (self.mileage / 100000)) # decrease price based on mileage return used_price def calculate_cost(self): return self.calculate_used_price() def save_to_database(self): model = TireModel() data = ( self.tire_brand, self.tire_size, self.tire_type, self.tire_color, self.tire_speed, self.tire_load, self.tire_tread, self.price, self.tire_condition, self.mileage, None, None, None, self.calculate_cost() ) model.insert_tire(data) class TireRepair(NewTire):

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