python下载想听的有声书，让喜马拉雅收费，我是程序员！

from urllib import parse,request
import urllib

header_dict = {'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko'}
for i in range(1328,3000):
    url="https://ting55.com/book/9580-"+str(i)
    req = request.Request(url=url, headers=header_dict)
    res = request.urlopen(req)
    res = res.read()
    body=str(res,encoding='utf-8')
    startStr='(function(){var a={m4a:"'
    start=body.find(startStr)
    end=body.find('"};ting55_play("m4a",')
    url=body[start+len(startStr):int(end)]
    LocalPath="D:/超品相师/"+str(i)+".m4a"
    print('正在下载第'+str(i)+"集...")
    urllib.request.urlretrieve(url,LocalPath)