帮我设计一个汽车租赁程序，并写出所有代码

好的，下面是一个简单的汽车租赁程序的代码，你可以根据自己的需求进行修改和扩展：

import datetime

# 定义车辆类
class Car:
    def __init__(self, car_id, car_type, daily_rent):
        self.car_id = car_id
        self.car_type = car_type
        self.daily_rent = daily_rent
        self.is_rented = False

    def __str__(self):
        return f"{self.car_id} - {self.car_type} - {self.daily_rent}/day"

# 定义租车记录类
class RentalRecord:
    def __init__(self, car, start_date, end_date):
        self.car = car
        self.start_date = start_date
        self.end_date = end_date

    def get_rental_days(self):
        return (self.end_date - self.start_date).days + 1

    def get_rental_fee(self):
        rental_days = self.get_rental_days()
        return rental_days * self.car.daily_rent

    def __str__(self):
        return f"{self.car.car_id} - {self.car.car_type} - {self.start_date} to {self.end_date} - {self.get_rental_fee()}"

# 定义车辆管理类
class CarManager:
    def __init__(self):
        self.cars = []
        self.rental_records = []

    def add_car(self, car_id, car_type, daily_rent):
        car = Car(car_id, car_type, daily_rent)
        self.cars.append(car)

    def get_available_cars(self):
        return [car for car in self.cars if not car.is_rented]

    def get_car_by_id(self, car_id):
        for car in self.cars:
            if car.car_id == car_id:
                return car
        return None

    def rent_car(self, car_id, start_date_str, end_date_str):
        car = self.get_car_by_id(car_id)
        if car is None:
            return "Car not found"
        if car.is_rented:
            return "Car already rented"
        start_date = datetime.datetime.strptime(start_date_str, "%Y-%m-%d").date()
        end_date = datetime.datetime.strptime(end_date_str, "%Y-%m-%d").date()
        if end_date < start_date:
            return "Invalid rental period"
        rental_record = RentalRecord(car, start_date, end_date)
        self.rental_records.append(rental_record)
        car.is_rented = True
        return f"Rented {car.car_type} from {start_date} to {end_date}, total fee: {rental_record.get_rental_fee()}"

    def return_car(self, car_id, return_date_str):
        car = self.get_car_by_id(car_id)
        if car is None:
            return "Car not found"
        if not car.is_rented:
            return "Car not rented"
        return_date = datetime.datetime.strptime(return_date_str, "%Y-%m-%d").date()
        rental_record = None
        for record in self.rental_records:
            if record.car == car and record.end_date >= return_date:
                rental_record = record
                break
        if rental_record is None:
            return "Invalid return date"
        rental_days = (return_date - rental_record.start_date).days + 1
        rental_fee = rental_days * car.daily_rent
        rental_record.end_date = return_date
        car.is_rented = False
        return f"Returned {car.car_type} on {return_date}, rental fee: {rental_fee}"

# 测试程序
if __name__ == "__main__":
    car_manager = CarManager()
    car_manager.add_car("001", "SUV", 100)
    car_manager.add_car("002", "Compact", 50)
    car_manager.add_car("003", "Luxury", 200)

    while True:
        print("1. Rent a car")
        print("2. Return a car")
        print("3. Exit")
        choice = input("Please select an option: ")
        if choice == "1":
            available_cars = car_manager.get_available_cars()
            if len(available_cars) == 0:
                print("No car available")
                continue
            print("Available cars:")
            for car in available_cars:
                print(car)
            car_id = input("Please select a car to rent: ")
            start_date = input("Please enter the start date (YYYY-MM-DD): ")
            end_date = input("Please enter the end date (YYYY-MM-DD): ")
            result = car_manager.rent_car(car_id, start_date, end_date)
            print(result)
        elif choice == "2":
            car_id = input("Please enter the car ID: ")
            return_date = input("Please enter the return date (YYYY-MM-DD): ")
            result = car_manager.return_car(car_id, return_date)
            print(result)
        elif choice == "3":
            break
        else:
            print("Invalid option, please try again")

注意，以上代码只是一个简单的示例，可能还有很多需要完善的地方，例如输入的日期格式不正确时会导致程序出错，用户输入的租车时间和归还时间可能会跨越多个月份等等。因此，你需要根据实际需求对程序进行修改和优化。