python火车票售票系统

import sys, os, json, pandas as pd# 定义火车票类class TrainTicket:    def __init__(self, source, destination, date, time, price):        self.source = source        self.destination = destination        self.date = date        self.time = time        self.price = price# 读取火车票数据with open('train_tickets.json') as f:    data = json.load(f)    tickets = [TrainTicket(**ticket) for ticket in data]# 处理用户界面while True:    # 显示菜单    print("1. 搜索火车票")    print("2. 预订火车票")    print("3. 取消火车票")    print("4. 退出")    # 获取用户选择    choice = int(input("Enter your choice: "))    if choice == 1:        # 搜索火车票        ...    elif choice == 2:        # 预订火车票        ...    elif choice == 3:        # 取消火车票        ...    elif choice == 4:        # 退出        break    else:        print("Invalid choice!")# 保存火车票数据with open('train_tickets.json', 'w') as f:    json.dump([ticket.__dict__ for ticket in tickets], f)