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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def DbGetAttributeAlias2(self, argin):
 """ Get the attribute alias from the attribute name. Returns one empty string if nothing found in database :param argin: The attribute name (dev_name/att_name) :type: tango.DevString :return: The attribute alias name (or empty string) :rtype: tango.DevString """

        self._log.debug("In DbGetAttributeAlias2()")
        attr_name = argin[0]
        return self.db.get_attribute_alias2(attr_name)