爬虫，第十次实战之线程池（梨视频下载）

最后几行代码应该是个bug，不知道怎么处理，在最后一两步，需要大神

import requests
import re
from lxml import etree
from multiprocessing.dummy import Pool
headers = {'User-Agen':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 UBrowser/6.2.4098.3 Safari/537.36'}
url = 'https://www.pearvideo.com/category_5'
page_text = requests.get(url=url,headers=headers).text
tree = etree.HTML(page_text)
page_list = tree.xpath('//*[@id="listvideoListUl"]/li')
# print(page_list)
url_list = []
for li in page_list:
    lis = 'https://www.pearvideo.com/'+li.xpath('./div/a/@href')[0]
    video_name = li.xpath('./div/a/div[2]/text()')[0] + '.mp4'
    # print(video_name)
    lis_page_text = requests.get(url=lis,headers=headers).text
    ex = 'srcUrl="(.*?)",vdoUrl'
    video_url = re.findall(ex,lis_page_text,re.S)
    # print(video_url)
    dic = {
        'name' : video_name,
        'video_player' : video_url
    }
    url_list.append(dic)
def Get_page_data(dic):
    urls = dic[video_url]
    page_content = requests.get(url=urls,headers=headers).content
    with open(dic[video_name],'wb') as fp:
        fp.write(page_content)
pool = Pool(4)
pool.map(Get_page_data,url_list)