def current_user(self):
        url = self.root_collection['response']['collections'][0]['links']\
        ['current-user']['href']
        return url
https://familysearch.org/developers/docs/api/users/Current_User_resource
dataset/ETHPy150Open AmEv7Fam/familysearch-python-sdk-opensource/familysearch/user.py/User.current_user