Takes an access_id, probably obtained from the get_access_list structure, and revokes that access.
            No return value, but may raise ValueError.

def revoke_user_access( self, access_id ):
        '''
            Takes an access_id, probably obtained from the get_access_list structure, and revokes that access.
            No return value, but may raise ValueError.
        ''' 
        path = "/api/v3/publisher/user/access/revoke"

        data = {
            'api_token': self.api_token, 
            'access_id': access_id,
        }

        r = requests.get( self.base_url + path, data=data )

        if r.status_code != 200:
            raise ValueError( path + ":" + r.reason )