如何搜索文本文件的文件夹以查看是否存在特定的字符串，然后使用Python提取两个单词之间的字符串？

import os
import fnmatch

def search_files(folder, pattern):
    for root, dirs, files in os.walk(folder):
        for file in files:
            if fnmatch.fnmatch(file, pattern):
                file_path = os.path.join(root, file)
                if search_string_in_file(file_path, "特定字符串"):
                    extract_words_between(file_path, "单词1", "单词2")

def search_string_in_file(file_path, search_string):
    with open(file_path, 'r') as file:
        for line in file.readlines():
            if search_string in line:
                return True
    return False

def extract_words_between(file_path, word1, word2):
    with open(file_path, 'r') as file:
        for line in file.readlines():
            words = line.split()
            if word1 in words and word2 in words:
                index1 = words.index(word1)
                index2 = words.index(word2)
                if index1 < index2 - 1:
                    extracted_string = ' '.join(words[index1+1:index2])
                    print(extracted_string)

# 搜索指定文件夹下的文本文件，并查找特定字符串并提取两个单词之间的字符串
search_files("文件夹路径", "*.txt")