我需要一个Python简易的火车购票系统

好的，我可以帮你设计一个简易的火车购票系统，使用 Python 编写。该系统可以实现以下功能：

1. 查询车票余量：根据用户选择的出发地、目的地、日期和车次，查询该车次的余票数量。
2. 选择乘客类别：根据用户选择的乘客类别（如成人、儿童、学生等），显示相应的票价和折扣信息。
3. 选择票等：根据用户选择的票等（如硬座、软座、硬卧、软卧等），显示相应的票价和余票数量。
4. 购票：用户选择乘客姓名、证件号码和座位号后，可以进行支付，系统会生成相应的订单并发送确认信息给用户。

以下是一个简单的示例代码：

class Train:
    def __init__(self, train_num, start_station, end_station, depart_date, hard_seat_num, soft_seat_num, hard_berth_num, soft_berth_num):
        self.train_num = train_num
        self.start_station = start_station
        self.end_station = end_station
        self.depart_date = depart_date
        self.hard_seat_num = hard_seat_num
        self.soft_seat_num = soft_seat_num
        self.hard_berth_num = hard_berth_num
        self.soft_berth_num = soft_berth_num

    def check_ticket(self, seat_type):
        if seat_type == 'hard_seat':
            return self.hard_seat_num
        elif seat_type == 'soft_seat':
            return self.soft_seat_num
        elif seat_type == 'hard_berth':
            return self.hard_berth_num
        elif seat_type == 'soft_berth':
            return self.soft_berth_num
        else:
            return 0

class Ticket:
    def __init__(self, train_num, seat_type, passenger_type, passenger_name, passenger_id, seat_num, price):
        self.train_num = train_num
        self.seat_type = seat_type
        self.passenger_type = passenger_type
        self.passenger_name = passenger_name
        self.passenger_id = passenger_id
        self.seat_num = seat_num
        self.price = price

class TicketSystem:
    def __init__(self):
        self.trains = []
        self.tickets = []

    def add_train(self, train):
        self.trains.append(train)

    def query_ticket(self, train_num, seat_type):
        for train in self.trains:
            if train.train_num == train_num:
                ticket_num = train.check_ticket(seat_type)
                return ticket_num
        return 0

    def buy_ticket(self, train_num, seat_type, passenger_type, passenger_name, passenger_id, seat_num):
        for train in self.trains:
            if train.train_num == train_num:
                ticket_num = train.check_ticket(seat_type)
                if ticket_num > 0:
                    ticket_price = self.calculate_price(seat_type, passenger_type)
                    ticket = Ticket(train_num, seat_type, passenger_type, passenger_name, passenger_id, seat_num, ticket_price)
                    self.tickets.append(ticket)
                    train.hard_seat_num -= 1
                    return ticket
        return None

    def calculate_price(self, seat_type, passenger_type):
        # 根据不同的座位类型和乘客类型计算票价
        pass

# 示例代码
system = TicketSystem()
train = Train('G1234', '北京', '上海', '2022-01-01', 100, 50, 50, 20)
system.add_train(train)
ticket_num = system.query_ticket('G1234', 'hard_seat')
if ticket_num > 0:
    ticket = system.buy_ticket('G1234', 'hard_seat', 'adult', '张三', '110101199001010001', 'A1')
    print('购票成功，订单号为：{}'.format(ticket.order_id))
else:
    print('该车次{}硬座已售罄'.format(train.train_num))

以上是一个简单的 Python 火车购票系统示例，你可以根据自己的需求进行修改和完善。