python爬前程无忧,xpath后的list为[]

#导入模块
import requests
import pandas
from fake_useragent import UserAgent
from lxml import etree

data_list=[]
salary=""
position='分析'
curPage=1
#获取网页内容
def gethtml(url):
    headers={'User-Agent':str(UserAgent().random)
             }
    response=requests.get(url,headers=headers)
    r_response=response.content.decode('gbk')
    return r_response

#获取网页数据
def getpath(r):
    html=etree.HTML(r)
    b=html.xpath('//div[@class="j_joblist"]/div')
    for i in b:
        list={}
        list['职位'] = i.xpath(".a/p[1]/span[1]/text()")[0]
        data_list.append(list)
    return data_list

#翻页
def next_page():
    url_np='https://search.51job.com/list/000000,000000,0000,22%252c05%252c06%252c44%252c60,9,{}-,{},2,{}.html?lang=c&postchannel=0000&workyear=99&cotype=99&degreefrom=99&jobterm=99&companysize=99&ord_field=0&dibiaoid=0&line=&welfare='
    url_list=[url_np.format(salary,position,i) for i in range(1,curPage+1)]
    return url_list

#主程序
def run_51job():
    page = next_page()
    for i in page:
        gh=gethtml(i)
        gp=getpath(gh)
        gp = pandas.DataFrame(gp)
        gp.to_excel('./51job.xlsx', index=False)
    return gp

if __name__ == '__main__':
    print(run_51job())

改了好多xpath路径，但得到结果仍为[]（用xpath helper查看无问题）,求大佬指点一二：

你请求访问返回的html中就没有这个，应该是没加载，看下接口把，或者模拟器访问