爬虫生成dict后，想将其写入csv文件，却出错
使用jupyter notebook,window环境。

具体代码如下

import requests

from multiprocessing.dummy import Pool as ThreadPool

from lxml import etree

import sys

import time

import random

import csv


def spider(url):

    header={

        'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36'

    }

    timeout=random.choice(range(31,50))

    html = requests.get(url,header,timeout=timeout)

    time.sleep(random.choice(range(8,16)))

    selector = etree.HTML(html.text)

    content_field = selector.xpath('//*[@class="inner"]/p[3]/p[2]/ul/li')

    item ={}

    for each in content_field:

        g = each.xpath('a/p[1]/p[1]/h3/span/text()')

        go = each.xpath('a/p[1]/p[2]/p/h3/text()')

        h = each.xpath('a/p[1]/p[2]/p/p/text()[1]')

        j= each.xpath('a/p[1]/p[1]/p/text()[2]')

        ge = each.xpath('a/p[1]/p[2]/p/p/text()[3]')

        x = each.xpath('a/p[1]/p[1]/p/text()[3]')

        city = each.xpath('a/p[1]/p[1]/p/text()[1]')

        gg = each.xpath('a/p[2]/span/text()')

        item['city']="".join(city)

        item['hangye']="".join(hangye)

        item['guimo']="".join(guimo)

        item['gongsi']="".join(gongsi)

        item['gongzi']="".join(gongzi)

        item['jingyan']="".join(jingyan)

        item['xueli']="".join(xueli)

        item['gongzuoneirong']="".join(gongzuoneirong)

        fieldnames =['city','hangye','guimo','gongsi','gongzi','jingyan','xueli','gongzuoneirong']

        with open('bj.csv','a',newline='',errors='ignore')as f:

            f_csv=csv.DictWriter(f,fieldnames=fieldnames)

            f_csv.writeheader()

            f_csv.writerow(item)


if __name__ == '__main__':
    pool = ThreadPool(4)
    f=open('bj.csv','w')
    page = []
    for i in range(1,100):
        newpage = 'https://www.zhipin.com/c101010100/h_101010100/?query=%E6%95%B0%E6%8D%AE%E8%BF%90%E8%90%A5&page='+str(i) + '&ka=page-' + str(i)
        page.append(newpage)
        
    results = pool.map(spider,page)
    pool.close()
    pool.join()
    f.close()

运行上面代码，提示错误为

ValueError: too many values to unpack (expected 2)
通过查询原因是要将dict遍历，需要dict.items()的形式。但在上述代码中如何实现，一直没有理顺，求教各位