爬虫初识(爬取dytt电影列表及下载地址)

import re
from  urllib.request import urlopen
def getPage(url):
    response=urlopen(url)
    return response.read().decode('gbk',errors='ignore')
def parsePage(s):
    com=re.compile(r'<td height="26">.*?<b>.*?<a href="(?P<url_name>.*?)" class="ulink">.*?',re.S)
    ret=com.finditer(s)
    for i  in  ret :
        return "http://www.dytt8.net"+i.group("url_name")
def parsePage1(s):
    com=re.compile(r'<div >'+
'◎主.*?演(?P<zhuyan>.*?)<br /><br />◎简.*?介.*?<td.*?><a href="(?P<xiazaidizhi>.*?)">',re.S)
    ret1=com.finditer(s)
    # print('****************************************************************')
    for i  in  ret1 :
        yield {"yiming":(re.sub("[\u3000]", "",i.group('name'))),
                "pianming":re.sub("[\u3000]", "",i.group("pianname")),
                "daoyan":re.sub("[\u3000]", "",i.group("daoyan")),
                "zhuyan":re.sub("[\u3000]", "",i.group("zhuyan")),
                "xiazaidizhi":re.sub("[\u3000]", "",i.group("xiazaidizhi"))}
def main(num):
    url="http://www.dytt8.net/html/gndy/dyzz/list_23_%s.html" % num
    response_html=getPage(url)
    xiangqing=parsePage(response_html)
    response1_html = getPage(xiangqing)
    ret=parsePage1(response1_html)
    f = open("move_list", "a", encoding="utf8")
    for obj in ret:
        print(obj)
        data = str(obj)
        f.write(data + "\n")
for i in range(1,181):
    main(i)