用python爬取贴吧，爬不了最底层的评论

如标题，除最底层的评论外，都可以正常爬取。源代码也找了，没有发现问题。

import re
import urllib.request
import xlwt
from bs4 import BeautifulSoup
import time
# time.sleep(5)
def main():
    url1 ='http://tieba.baidu.com/hottopic/browse/hottopic?topic_id=865930&topic_name=LOL%E6%89%8B%E6%B8%B8%E4%BD%93%E9%AA%8C%E6%84%9F%E5%8F%97&red_tag=p3027039361'
    savelist = gat(url1)
message = re.compile(r'<p class="content">(.*?)</p>',re.S)
def gat(url1):
    url =url1
    html = breal(url)
    soup = BeautifulSoup(html,'html.parser')#注意该步骤
    save=[]
  

 

 for item in soup('div', class_="center"):
        itrm = str(item)
        print(itrm)#测试是否成功获取到网页信息
        mess = re.findall(message,itrm)
        # print(mess)
        save.append(mess)
    # for i in soup('li', class_="thread-item"):
    #     print(i)
def breal(url):
    head = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36'}
    request = urllib.request.Request(url,headers=head)
    html = ''
    try:
        reopen = urllib.request.urlopen(request)
        html = reopen.read().decode('utf-8')
    except urllib.error.URLError as e:
        if hasattr(e, "code"):
            print(e.code)
        if hasattr(e, "reason"):
            print(e.reason)
    return html
if __name__ == '__main__':
    main()

如图显示‘’在加载‘ ’并且爬取的不完整