猫眼 top_100 爬取 ___只完成了第一页

# python 3.7
from urllib.request import Request,urlopen
import time,re,csv

class Maoyan(object):
    def __init__(self):
        self.header = {
        'Connection': 'keep - alive',
            'Cookie': 'uuid_n_v=v1; uuid=16B52300EED311E8A50EC9D5D894D382A1072CB6CA3D4BAA95D7EA39B1BB3637; _lxsdk_cuid=1673eb37e1fc8-011175d5446e19-424f0928-13c680-1673eb37e20c8; _lxsdk=16B52300EED311E8A50EC9D5D894D382A1072CB6CA3D4BAA95D7EA39B1BB3637; _csrf=6597fe121a59ff12f8bf1b793cb7d29274a118e066c86f8bf88b8e765b7d4dad; _lx_utm=utm_source%3DBaidu%26utm_medium%3Dorganic; __mta=145127947.1542945209936.1542945209936.1542954826219.2; _lxsdk_s=1673f4639ac-357-82a-15d%7C%7C4',
            'Host': 'maoyan.com',
            'Referer': 'http://maoyan.com/board',
            'Upgrade - Insecure - Requests': 1,
            'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36'

        }

    def get_page(self,url):
        res = urlopen(Request(url =url,headers=self.header)).read()
        self.parsePage(res.decode())

    def parsePage(self,res):
        patten = 'data-val="{.*?}">(.*?)</a></p>\s+<p class="star">\s+(.*?)\s+</p>\s+<p class="releasetime">(.*?)</p>'
        a = re.findall(patten,res)
        self.write(a)

    def write(self,a):
        for i in a:
            with open('11.csv','a+',newline='',encoding='gbk') as f:
                a = csv.writer(f)
                a.writerow(list(i))

    def wordon(self):
        pass

if __name__ == '__main__':
    a = Maoyan()
    a.get_page('http://maoyan.com/board/4?offset=0')