练习2---（request，ajax爬取头条数据）

`import requests
import json
from urllib.parse import urlencode
from requests.exceptions import RequestException

def get_page_one():
headers = {"user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36
x-csrftoken: 3672930e587f199dfed3b6e747e1709c"}
data = {
"category": "gallery_photograthy",
"max_behot_time": "1605927222",
"utm_source": "toutiao",
"_signature": "02B4Z6wo00f019Jc5IwAAIBDapqa0EtlsVvSWeAAAKs6zY2gmvCu0bUpRM8sx270VHDRA2EYdgTT-0b0VIVwXOEFx5JrfRJ.keX4NN4dO4UfrDxSlZjI6Ej6gV9YMEE3oYBLpeIdkk3oWZgV78"
}
url = 'https://www.toutiao.com/api/pc/feed/?' + urlencode(data)
try:
response = requests.get(url, headers=headers)
if response.status_code == 200:
return response.text
else:
return None
except RequestException:
print('请求页面出错')
return None

def parse_one_page(url):
data = json.loads(url)
print(data)
if data and 'data' in data.keys():
for item in data.get('data'):
if 'middle_image' in item.keys():
yield {
'title': item.get('title'),
'middle_image': item.get('middle_image'),
'image_list': item.get('image_list')
}

def main():
response = get_page_one()
for result in parse_one_page(response):
print(result)

if name == 'main':
main()
`