两种方式:
1.直接获取cookies对象,适用于不需要自行封装的情况
response.cookies
requests.post(.....cookies=cookies)
2.直接获取sessionid,然后自行封装cookies对象,适用于需要修改cookies对象的情况
sessionid = response.cookies["sessionid"]
cookies={"sessionid":sessionid,"xxx":"yyy"}
requests.post(.....cookies=cookies)