def get_user(self, user_name=None):
        """
        Retrieve information about the specified user.

        If the user_name is not specified, the user_name is determined
        implicitly based on the AWS Access Key ID used to sign the request.

        :type user_name: string
        :param user_name: The name of the user to delete.
                          If not specified, defaults to user making
                          request.

        """
        params = {}
        if user_name:
            params['UserName'] = user_name
        return self.get_response('GetUser', params)