Python简单爬虫爬取多页图片

#!/usr/bin/python
# coding utf-8
import re
import time
import urllib
def getHtml():
x=0
for i in range(1,41):
url = ' '% i
page = urllib.urlopen(url)
html = page.read()
reg = r'src="(.*?\.jpg)" pic_ext'
imgre = re.compile(reg)
imglist = re.findall(imgre,html)
print(imglist)
time.sleep(1)
# x = 0
for imgurl in imglist:
urllib.urlretrieve(imgurl,'%s.jpg' % x)
x+=1
getHtml()