python爬取单张图片

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import urllib.request
response = urllib.request.urlopen("http://pic36.photophoto.cn/20150728/0022005597823716_b.jpg")  #图片地址
cat_img = response.read()
with open('D:/python/summer/images/cat.jpg','wb') as f:   #保存路径
    f.write(cat_img)