code: def delete_user_policy(self, user_name, policy_name):
          
          params = {'UserName' : user_name,
                    'PolicyName' : policy_name}
          return self.get_response('DeleteUserPolicy', params, verb='POST')
docs: Deletes the specified policy document for the specified user.
  
          :type user_name: string
          :param user_name: The name of the user the policy is associated with.
  
          :type policy_name: string
          :param policy_name: The policy document to delete.