python 递归搜索 复制文件到指定路径

import os.shutil
def search_file(path, result):
    child_files=os.listdir(path)
    for child in child_files:
        child = os.path.join(path, child)
        result.append(child)
        if os.path.isdir(child):
            search_file(child, result)
if __name__ == '__main__':   
   # 结果保存集合
    result = list()
    # 输入搜索目录和要保存指定的目录
    input_dir = input("请输入待搜索的目录")
    output_dir = input("请输入保存的文件目录")
    search_file(input_dir , output_dir)
    print(33)
    for res in result:
        print(os.path.isfile(res))
        if os.path.isfile(res) and res.endswith(".txt"):
            print("move %s" % res)
            shutil.move(res, output_dir)