python3下载图片

import urllib.request
import socket
import re
import sys
import os

targetDir = r"E:\\DATA\常用py脚本" 

def destFile(path):
    if not os.path.isdir(targetDir):
        os.mkdir(targetDir)
    pos = path.rindex('/')
    t = os.path.join(targetDir, path[pos+1:])
    return t  

if __name__ == "__main__":
    hostname = "http://www.douban.com"
    req = urllib.request.Request(hostname)
    webpage = urllib.request.urlopen(req)
    html = webpage.read()  

    #\s:任意空白字符
    #^：匹配字符串的开头
    #*:匹配前一个字符0次或无数次
    #?:匹配前一个字符0次或1次

    result=re.findall(r'(https:[^\s]*?(jpg|png|gif))', str(html))
    #print(result)

    for link, t in result:
        #print(link,t)
        urllib.request.urlretrieve(link, destFile(link))