知識點：

1、爬取網站圖片

import re
from urllib import request

import time,os
headeers = {‘User-Agent‘:‘Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36‘}

url = ‘http://699pic.com/food.html?sem=1&sem_kid=45712&sem_type=1‘
res = request.Request(url=url,headers=headeers)
result 
 
= request.urlopen(res).read().decode(‘utf-8‘)
a=r"(?<=data-original=\").+?(?=\")|(?<=data-original=\‘).+?(?=\‘)"
urls = re.findall(a, result)


def down_load(urls):
    name2 = ‘img‘
    os.mkdir(name2)
    print(len(urls))
    num = 1
    for i in urls:
        jpg = request.urlopen(i).read()
        name1 
 
=str(num) +‘.jpg‘
        with open(name2+‘/‘+name1, ‘wb‘) as f:
            f.write(jpg)
        num += 1
if __name__ == ‘__main__‘:
  down_load(urls)

網絡編程-協程-3、使用協程創建多任務圖片下載