def put_user_policy(self, user_name, policy_name, policy_json):
        params = {'UserName' : user_name,
                  'PolicyName' : policy_name,
                  'PolicyDocument' : policy_json}
        return self.get_response('PutUserPolicy', params, verb='POST')
Combine a list of subexpressions into a single expression, using
dataset/ETHPy150Open darcyliu/storyboard/boto/iam/connection.py/IAMConnection.put_user_policy--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/db/backends/__init__.py/BaseDatabaseOperations.combine_expression