文件夹中删除一半的照片

import os
import random

num = 0;
rootdir = r'C://Users//lisihong//Desktop//1//Images'
for root,dirs,files in os.walk(rootdir):
    for dir in dirs:
        print(os.path.join(root,dir))
        num = 0;
    for file in files:
      feed = random.randint(0, 10)
      if feed <= 5:
        os.remove(os.path.join(root,file))
        print(feed)
        print(os.path.join(root,file), file)
        num = num + 1
    print(num)