<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def DbGetAliasDevice(self, argin):
 """ Get device name from its alias. :param argin: Alias name :type: tango.DevString :return: Device name :rtype: tango.DevString """

        self._log.debug("In DbGetAliasDevice()")
        if not argin:
            argin = "%"
        else:
            argin = replace_wildcard(argin)
        return self.db.get_alias_device(argin)