1. 获取cookie:
ssession = requests.Session()
session.cookies.get_dict() # 获取字典形式的cookie
2.将cookiejar转为字典:
cookies = requests.utils.dict_from_cookiejar(r.cookies)
3.将字典转为cookiejar:
cookies = requests.utils.cookiejar_from_dict(cookie_dict, cookiejar=None, overwrite=True)