需求：列表a是列表b的子列表，现在想找出a中与b相比少的元素

#!usr/bin/env python
# -*- coding:utf-8 -*-
"""
@author:touch-spring
@file: test.py
@time: 2021/10/25
"""
if __name__ == '__main__':
    new_no_list = []
    with open('./data/1000_item_info.txt') as f:
        for line in f:
            new_no_list.append(line.split(',')[0].strip('\n'))
    print(len(new_no_list))
    old_no_list = []
    with open('./data/materialNo.txt') as f:
        for line in f:
            old_no_list.append(line.strip('\n'))
    print('old_no_list',len(old_no_list))
    s_list = []
    for i in old_no_list:
        if i in new_no_list:
            pass
        else:
            s_list.append(i)
    for i in s_list:
        print(i)

找出想要的文件

#!usr/bin/env python
# -*- coding:utf-8 -*-
"""
@author:touch-spring
@file: test.py
@time: 2021/10/26
"""
import os
import shutil  # 导入移动模块
if __name__ == '__main__':
    g = os.walk("D:\\ZKH_IMG\\")    # 文件根目录
    src_dir_path = 'D:\\ZKH_IMG'    # 原文件目录
    to_dir_path = 'D:\\ZHK_test\\筛选3\\'     # 目标文件目录
    materiaNo_list = []
    with open('D:\\ZHK_test\\materialNo.txt',encoding='utf-8') as f:
        for line in f:
            materiaNo_list.append(line.strip("\n"))
    for path, dir_list, file_list in g:
        for file_name in file_list:
            for i in materiaNo_list:
                new_file_name = str(file_name)
                try:
                    # file = new_file_name.split('_')[1]
                    file = new_file_name.split('-')[0]
                    if i == file:
                        print('当前物料号：%s,复制到----->%s'%(i,to_dir_path+file_name))
                        shutil.copy(src_dir_path +'/'+file_name,to_dir_path+'/'+file_name)
                except:
                    pass