求助大佬，这段爬虫代码有一部分看不懂

雪白七七子111

这段代码注释的地方和while循环看不太懂！求大佬解释一下

#这是一个通过关键字来爬取漏洞信息的模块
from lxml import etree
import requests
import re
import warnings 
warnings.filterwarnings("ignore")               #处理错误

headerss = {
    'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36 QIHU 360SE'
}

def KeyWord():
    content = input('请输入查询的关键字信息:')

    #调用绿盟科技的漏洞库
    print('以下是调用的绿盟数据库：')
    url = 'http://www.nsfocus.net'
    url1 = f'http://www.nsfocus.net/index.php?act=sec_bug&type_id=&os=&keyword={content}&page=1' 
    url1_re = requests.get(url=url1,headers=headerss)
    url1_re.encoding = ('utf-8')
    obj = re.compile(r'.*?共(?P<shuliang>.*?)条记录',re.S)  #这三行看不懂！
    url1_re_quantity = obj.findall(url1_re.text)                  #！！
    url1_re.close                                                            #！！
    yeshu = url1_re_quantity[0]
    yeshu = int(yeshu)
    yeshu = yeshu/15
    if yeshu % 15 != 0 :
        yeshu =yeshu +1

    i = 1
    while i <= yeshu :
        url11 = f'http://www.nsfocus.net/index.php?act=sec_bug&type_id=&os=&keyword={content}&page={i}'    
        url11_re = requests.get(url=url11,headers=headerss)
        url11_re.encoding = ('utf-8')
        url11_re_etree = etree.HTML(url11_re.text)
        url11_re_etree_title = url11_re_etree.xpath('/html/body/div[1]/section/div/section/div[1]/div[2]/div[2]/div[4]/ul/li
/a/text()')
        url11_re_etree_link = url11_re_etree.xpath('/html/body/div[1]/section/div/section/div[1]/div[2]/div[2]/div[4]/ul/li
/a/@href')
        
        j = 0
        while j < len(url11_re_etree_title) :
            print(url11_re_etree_title[j])
            print(url + url11_re_etree_link[j]) 
            j = j+1
        
        i = i+1


KeyWord()