用Python3下载网页图片

以知乎上的图片为例https://www.zhihu.com/question/40007169#answer-29511584

找到图片的地址，如

imgsrc="https://pic2.zhimg.com/a45404bcf9cc778c061dd7ca5416b7fd_b.jpg"

写出正则表达式imreg=re.compile('https://pic[0-9]\.zhimg\.com/[a-z 0-9]*_b\.jpg')

找到所有匹配的地址，用urlretrieve函数将图片下载到电脑。

from urllib.request import urlopen
from urllib.request import urlretrieve
import re

def getUrl(url):
    html=urlopen(url).read().decode()
    imreg=re.compile('https://pic[0-9]\.zhimg\.com/[a-z 0-9]*_b\.jpg')
    links=re.findall(imreg,html)

    i=0
    for link in links:
        i+=1
        print(link)
        path='E:/python/%d.jpg'%i
        urlretrieve(link,path)
getUrl('https://www.zhihu.com/question/40007169#answer-29511584')