def METHOD_NAME(self):
    """
    Retrieves the presence of the device
    Returns:
        bool: True if device is present, False if not
    """
    presence = False
    attr_path = PSU_DIR+self.psu_presence_attr
    attr_normal = "0 : normal"
    attr_rv = self.__get_attr_value(attr_path)
    if (attr_rv != 'ERR'):
        if (attr_rv == attr_normal):
            presence = True
    return presence