求如何修改python程序实现爬取未知页数的文章？

求求大佬帮忙啊

import requests
from lxml import etree


def get_paper_link(ur1):
    headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) '
                             'Chrome/100.0.4896.60 Safari/537.36 Edg/100.0.1185.29'}
    res1 = requests.get(ur1, headers=headers).text
    # print(res1)  # 然后找文章链接，引入解析包，使用lxml,然后使用xpath来查找目标doi

    html_xpath = etree.HTML(res1)
    paper_links = html_xpath.xpath('//h3[@]/a/@href')  # 找到了文章的链接
    doi_list = []  # 将doi存放到这个定义的列表中
    for link in paper_links:
        paper_link = link
        print(paper_link)
        # print(paper_link)  # 然后请求下面的网址，提取doi
        res2 = requests.get(paper_link, headers=headers).text
        html_xpath2 = etree.HTML(res2)
        try:  # 为没有doi的文章进行错误过滤
            paper_doi = html_xpath2.xpath('//div[@]/p[@]/text()')[0].strip()  # 提取doi列表中的元素
            if str(10) in paper_doi:
                doi_list.append(paper_doi)
            # break  # 先查看一个doi
        except:
            pass
    return doi_list  # 存入成功



ur1 = 'https://xueshu.baidu.com/s?wd=%E6%B0%B4%E4%B8%8B%E5%9B%BE%E5%83%8F%E5%A4%8D%E5%8E%9F&' \
      'rsv_bp=0&tn=SE_baiduxueshu_c1gjeupa&rsv_spt=3&ie=utf-8&f=8&rsv_sug2=1&sc_f_para=sc_tasktype%3D%7BfirstSimpleSearch%7D'\
get_paper_link(ur1)