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 urlopenfrom urllib.request import urlretrieveimport redef 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')