python 解析ajax请求带有json参数，请求方式是post的url（注意：参数的json格式的）

import requests
# tag = 'https://exercise.kingname.info/exercise_ajax_1.html'#最开始的网址，下面两个为子链接
url  = 'https://exercise.kingname.info/ajax_1_backend'
url2 = 'https://exercise.kingname.info/ajax_1_postbackend'

req = requests.get(url)
print(req.text)
import requests
# tag = 'https://exercise.k