运行下载的示例程序怎么抓取不到内容？

同学，你好！报错是因为没有把字典的key和value组合成元组的形式，json.loads(city_info)是字典，items()方法返回由键和值组成的元组类型数据，即(k,v)，for循环中有两个变量k和v，如果去掉items()，则for循环中变量取值不足，k和v两个变量要和字典中键值对应
加油，祝学习愉快~~~

同学，你好，

1、header中的Cookie和cookies是不一样的，同学直接输出header['Cookie']即可

2、二手车网站的js进行了重新编译，同学可根据下述代码获取信息

import requests
# 通过execjs这个包，来解析js
import execjs
import re
import json
from guazi_scrapy_project.handle_mongo import mongo

# 我们请求城市的接口
url = 'https://www.guazi.com/www/buy'

# cookie值要删掉，否则对方会根据这个值发现我们，并且屏蔽我们
# 要通过正则表达式处理请求头,里面有空格，大家一定要注意
header = {
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
    "Accept-Encoding": "gzip, deflate, br",
    "Accept-Language": "zh-CN,zh;q=0.9",
    "Connection": "keep-alive",
    "Host": "www.guazi.com",
    "Referer": "https://www.guazi.com/www/buy",
    "Upgrade-Insecure-Requests": "1",
    "User-Agent": "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3610.2 Safari/537.36",
}

response = requests.get(url=url, headers=header)
# 设置返回的编码
response.encoding = 'utf-8'
if '正在打开中,请稍后' in response.text:
    # 通过正则表达式获取了相关的字段和值
    value_search = re.compile(r"anti\('(.*?)','(.*?)'\);")
    string = value_search.search(response.text).group(1)
    key = value_search.search(response.text).group(2)
    # print(string, key )
    # 读取，我们破解的js文件
    with open('guazi.js', 'r') as f:
        f_read = f.read()
    # 使用execjs包来封装这段JS,传入的是读取后的js文件
    js = execjs.compile(f_read)
    js_return = js.call('anti', string, key)
    cookie_value = 'antipas=' + js_return
    header['Cookie'] = cookie_value
    response_second = requests.get(url=url, headers=header)
    city_search = re.compile(r'({.*?});')
    brand_search = re.compile(r'href="\/www\/(.*?)\/c-1/#bread"\s+>(.*?)</a>')
    city_list = city_search.findall(response_second.text)
    # print(city_list)
    brand_list = brand_search.findall(response_second.text)
    # print(brand_list)
    for city_info in city_list[2:]:
        # print(json.loads(city_info))
        for k, v in json.loads(city_info).items():
            # print(v)
            for city in v:
                # print(city['name'])
                if city['name'] == '北京':
                    for brand in brand_list:
                        info = {}
                        # https://www.guazi.com/anqing/buy
                        # https://www.guazi.com/anqing/audi/#bread
                        # https://www.guazi.com/anqing/audi/o1i7/#bread
                        info['task_url'] = 'https://www.guazi.com/' + city['domain'] + '/' + brand[0] + '/' + 'o1i7'
                        info['city_name'] = city['name']
                        info['brand_name'] = brand[1]
                        info['item_type'] = 'list_item'
                        # print(info)
                        # 保存到mongodb里面去
                        mongo.save_task('guazi_task', info)

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