可以使用文件、缓存或内存等方式来存储聊天数据，以下是一个使用文件存储聊天数据的示例：

import os
import json

class ChatData:

    def __init__(self, filename):
        self.filename = filename

    def save_message(self, message):
        if os.path.exists(self.filename):
            with open(self.filename, 'r') as f:
                data = json.load(f)
        else:
            data = []

        data.append(message)

        with open(self.filename, 'w') as f:
            json.dump(data, f)

    def get_messages(self):
        if os.path.exists(self.filename):
            with open(self.filename, 'r') as f:
                data = json.load(f)
        else:
            data = []

        return data

使用示例：

chat = ChatData('chat_data.json')

chat.save_message('hello')
chat.save_message('world')

messages = chat.get_messages()

print(messages) # ['hello', 'world']