python学习，爬某宝图片

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import urllib.request
import re

keyname="短裙"
key=urllib.request.quote(keyname)#编码

headers=("User-Agent","Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.53 Safari/537.36")
opener=urllib.request.build_opener()
opener.addheaders=[headers]
urllib.request.install_opener(opener)

for i in range(0,101):
    url="https://s.taobao.com/search?q="+key+"&imgfile=&js=1&stats_click=search_radio_all%3A1&initiative_id=staobaoz_20181205&ie=utf8&bcoffset=6&ntoffset=6&p4ppushleft=1%2C48&s="+str(i*44)
    data=urllib.request.urlopen(url).read().decode("utf-8","ignore")
    pat='pic_url":"//(.*?)"'
    imagelist=re.compile(pat).findall(data)
    for j in range(0,len(imagelist)):
        thisimag=imagelist[j]
        thisimagurl="http://"+thisimag
        file="E:/practice/taobaotupian/"+str(i)+str(j)+".jpg"
        urllib.request.urlretrieve(thisimagurl,filename=file)