# -*- coding: utf-8 -*- 
''' 
  
''' 
import os 
from PIL import Image 
  
pic_dir = r"H:\新建文件夹" 
for filename in os.listdir(path=pic_dir): 
    if filename.startswith("SAM"): 
        pic_path = os.path.join(pic_dir, filename) 
        print (pic_path) 
        img = Image.open(pic_path ) 
        new_size = tuple( [ size//3 for size in img.size]  ) # 高度、宽度均变为原来的1/3 
        new_img = img.resize( new_size) 
        new_name = os.path.join(pic_dir, "small_" + filename) 
        new_img.save(new_name )