Python 正则表达式简单应用

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 目标：

Python3爬取https://www.imooc.com/course/list的所有图片

# coding=gbk
import re
from urllib import request
url = 'https://www.imooc.com/course/list' 
html = request.urlopen(url).read().decode('utf-8')
listurl = re.findall(r'src=.+\.jpg',html)
for i in range(len(listurl)):
    listurl[i] = re.sub(r'src="','',listurl[i])        #把src="去掉
i = 1
for url in listurl:
    f = open(str(i)+'.jpg','wb+')
    html = request.urlopen('https:'+url).read()    #必须要加上https:
    f.write(html)
    f.close()
    i += 1