python获取网页中所有图片并筛选指定分辨率的方法

import urllib.request   # 导入urllib模块import re     # 导入re模块import osfrom PIL import Imagehtmlurl = 'http://www.win4000.com/wallpaper_detail_134824_3.html'downloadpath = 'C://Users//yaowanjun//Desktop//img//'def getHTML(htmlurl):  req = urllib.request.urlopen(htmlurl)  buf = req.read()  return buf.decode('utf-8')def downloadImg(buf):  req = r'src="(.+?/.jpg)"' #正则表达式，匹配图片格式  imgreq = re.compile(req) #编译正则表达式  imglist = re.findall(imgreq, buf)  # print(imglist)  x = 0  if not os.path.isdir(downloadpath):#若没有则创建    os.makedirs(downloadpath)  paths = downloadpath  for imgurl in imglist:    f = open(paths + str(x) +'.jpg',"wb")  #打开文件    req = urllib.request.urlopen(imgurl)    buf = req.read()       #读出文件    f.write(buf)    f.close()    x = x + 1  return imglistdef saveImg():  for filenumber in os.walk(downloadpath):    # print(filenumber[2])    for files in filenumber[2]:      # print(files)      singleimg = Image.open(downloadpath + files)      singleimg.close()      #print(singleimg.size, singleimg.width, singleimg.height)      if singleimg.size == (1920, 1080):        print(singleimg)      else:        os.remove(downloadpath + files)buf = getHTML(htmlurl)downloadImg(buf)saveImg()