python3网络小爬虫下载图片实战

# -*- coding: utf-8 -*-
\'\'\' Created on Tue Jan 23 20:50:42 2018 @author: zhuxueming\'\'\'
import urllib.request
import re

def get_url(url):
  res = urllib.request.Request(url)
  res.add_header(\'User-Agent\',\'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36\')
  page = urllib.request.urlopen(res)
  html = page.read().decode(\'utf-8\')
  return html

def get_img():
  html = get_url(url)
  reg = r\'<img src="(.+\.jpg)"\'
  pat = re.findall(reg,html)
  i = 1
  for each in pat:
    each = re.sub(r\'/t/\',r\'/pre/\',each)
    print(each)
    try:
      urllib.request.urlretrieve(each,str(i)+\'.jpg\',None)
      print(\'第\'+str(i)+\'张下载成功\')
      i +=1
    except BaseException:
      print(\'第\'+str(i)+\'张下载失败\')
      i +=1
      continue
     
    
if __name__ == \'__main__\':
  url = \'http://www.ivsky.com/tupian/yuzhou_qiguan_v21241/\'
  get_img()