如何在目录中的所有文本文件中搜索字符串，并将找到的结果放入Python中的文本文件中

import os
import glob

search_dir = "目录路径"

search_string = "搜索字符串"

output_file = open("结果文件路径", "w")

for file_path in glob.glob(os.path.join(search_dir, "*.txt")):
    with open(file_path, "r") as file:
        # 读取文件内容
        content = file.read()
        # 搜索字符串
        if search_string in content:
            # 将搜索结果写入结果文件
            output_file.write("文件路径：" + file_path + "\n")
            output_file.write("搜索结果：" + content + "\n")

output_file.close()