搜索大量文件，并根据搜索字符串将某些行提取到单独的单个文件中

import os

def search_and_extract(search_string, file_path, output_file):
    with open(file_path, 'r') as file:
        lines = file.readlines()
        matching_lines = [line for line in lines if search_string in line]
        
        if matching_lines:
            with open(output_file, 'a') as output:
                output.write(f"File: {file_path}\n")
                output.write("".join(matching_lines))
                output.write("\n")

def search_files(search_string, directory_path, output_directory):
    for root, dirs, files in os.walk(directory_path):
        for file in files:
            file_path = os.path.join(root, file)
            output_file = os.path.join(output_directory, f"{file}_output.txt")
            search_and_extract(search_string, file_path, output_file)

# 示例调用
search_string = "example"
directory_path = "/path/to/search"
output_directory = "/path/to/output"
search_files(search_string, directory_path, output_directory)