python创建和维护每日文本文件，记录并防止给定数据列表中项目的重复

import os
from datetime import date

def write_to_today_txt(item):
    today = date.today()
    path = r'F:\log'
    if not os.path.exists(path):
        os.makedirs(path)
    today_txt_path = os.path.join(path, f"报表导出{today}.txt")

    # 检查今天的txt文件是否已经存在，如果存在则读取已经写入的数据
    existing_data = set()
    if os.path.isfile(today_txt_path):

        with open(today_txt_path, "r") as file:
            existing_data = set(file.read().splitlines())


    if item not in existing_data:
        with open(today_txt_path, "a") as file:
            file.write(item + "\n")
        existing_data.add(item)
        return False
    else:
        print(item,"已完成，无需再执行")
        return True

# 例如：数据列表

data_list = ['a', 'b', 'c']

# 调用函数
for item in data_list:
    write_to_today_txt(item)