def delete_login_profile(self, user_name):
        params = {'UserName' : user_name}
        return self.get_response('DeleteLoginProfile', params)
Replace missing values with non-missing values from the row above. E.g.::
dataset/ETHPy150Open darcyliu/storyboard/boto/iam/connection.py/IAMConnection.delete_login_profile--crossover with--dataset/ETHPy150Open alimanfoo/petl/petl/transform/fills.py/filldown