python写以下代码：用户可以在主界面添加待做事项，所有待做事项具有四种状态：TODO、正在进行、已完成、删除状态，新创建的待做事项处于TODO状态； 2.每个待做事项可以编辑文本说明； 3. 所有待做事项（所有状态）的数据，均保存在一个文件中，程序启动时读入，每次增加、改变事项数据后，保存数据； 4. 事项状态可以随时手动修改； 5.每个事项都可以设定开始和结束的提醒日期时间（日期/小时/分钟），到达提醒时间后，播放某个.mp3文件进行提醒，同时主界面/提醒区域显示明显的提示信息；

下面是一个简单的 Python 代码示例，可实现您所描述的待办事项应用程序。请注意，这只是一个基本示例，您可能需要根据自己的需求进行更改和扩展。

import datetime
import json
import os
import time
import winsound

FILENAME = "todos.json"

class TodoItem:
    def __init__(self, text):
        self.text = text
        self.status = "TODO"
        self.start_time = None
        self.end_time = None

    def __str__(self):
        return f"{self.text} ({self.status})"

class TodoList:
    def __init__(self):
        self.items = []

    def add_item(self, text):
        item = TodoItem(text)
        self.items.append(item)

    def remove_item(self, index):
        del self.items[index]

    def edit_item(self, index, text):
        self.items[index].text = text

    def change_status(self, index, status):
        self.items[index].status = status

    def set_start_time(self, index, start_time):
        self.items[index].start_time = start_time

    def set_end_time(self, index, end_time):
        self.items[index].end_time = end_time

    def save(self):
        with open(FILENAME, "w") as f:
            data = {
                "items": [vars(item) for item in self.items]
            }
            json.dump(data, f)

    def load(self):
        if os.path.exists(FILENAME):
            with open(FILENAME, "r") as f:
                data = json.load(f)
                self.items = [TodoItem(**item_data) for item_data in data["items"]]

    def show_items(self):
        for i, item in enumerate(self.items):
            print(f"{i+1}. {str(item)}")

    def start_reminders(self):
        while True:
            now = datetime.datetime.now()
            for item in self.items:
                start_time = item.start_time
                end_time = item.end_time
                if start_time and start_time <= now and item.status != "DONE":
                    item.status = "IN PROGRESS"
                    self.save()
                    winsound.PlaySound("reminder.mp3", winsound.SND_FILENAME | winsound.SND_ASYNC)
                    print(f"Reminder: {item.text} has started!")
                elif end_time and end_time <= now and item.status == "IN PROGRESS":
                    item.status = "DONE"
                    self.save()
                    winsound.PlaySound("reminder.mp3", winsound.SND_FILENAME | winsound.SND_ASYNC)
                    print(f"Reminder: {item.text} is done!")
            time.sleep(60)  # check every minute

def main():
    todo_list = TodoList()
    todo_list.load()

    while True:
        print("""
        TODO List
        ---------
        1. Add item
        2. Remove item
        3. Edit item
        4. Change status
        5. Set start time
        6. Set end time
        7. Show items
        8. Start reminders
        9. Quit
        """)

        choice = input("Enter your choice: ")

        if choice == "1":
            text = input("Enter task description: ")
            todo_list.add_item(text)
            todo_list.save()
        elif choice == "2":
            index = int(input("Enter index of item to remove: ")) - 1
            todo_list.remove_item(index)
            todo_list.save()
        elif choice == "3":
            index = int(input("Enter index of item to edit: ")) - 1
            text = input("Enter new task description: ")
            todo_list.edit_item(index, text)
            todo_list.save()
        elif choice == "4":
            index = int(input("Enter index of item to change status: ")) - 1
            status = input("Enter new status (TODO, IN PROGRESS, DONE): ")
            todo_list.change_status(index, status)
            todo_list.save()
        elif choice == "5":
            index = int(input("Enter index of item to set start time: ")) - 1
            start_time = input("Enter start time (YYYY-MM-DD HH:MM): ")
            start_time = datetime.datetime.strptime(start_time, "%Y-%m-%d %H:%M")
            todo_list.set_start_time(index, start_time)
            todo_list.save()
        elif choice == "6":
            index = int(input("Enter index of item to set end time: ")) - 1
            end_time = input("Enter end time (YYYY-MM-DD HH:MM): ")
            end_time = datetime.datetime.strptime(end_time, "%Y-%m-%d %H:%M")
            todo_list.set_end_time(index, end_time)
            todo_list.save()
        elif choice == "7":
            todo_list.show_items()
        elif choice == "8":
            todo_list.start_reminders()
        elif choice == "9":
            print("Goodbye!")
            break
        else:
            print("Invalid choice.")

if __name__ == "__main__":
    main()

该代码使用了自定义的 `TodoList` 和 `TodoItem` 类来表示待办事项和待办事项列表，并使用 JSON 文件来保存所有待办事项。在主程序中，用户可以通过选择菜单选项来添加、删除、编辑、更改状态和设置提醒时间等操作。在启动提醒功能后，程序会每分钟检查一次所有待办事项的状态，并在必要时播放提醒音频文件。