Ë §_ßd} ãó<—dZddlZddlmZmZmZddlmZd„Zd„Z y)z&Useful decorators for Traitlets users.éN)Ú ParameterÚ SignatureÚ signatureé)Ú Undefinedcó8—|tk(rtjS|S)z:Get default argument value, given the trait default value.)rrÚempty)Úvalues úr5sðÙ,ã ß3Ñ3å!ò<ó Er