Andrew Milton schrieb:

Did you paste this code, because it has errors...

Ahh sorry, I missed the last charakter, a ")". Here it is again: def genId(self,context): "asdf" items = [ int(e[2:]) for e in context.objectIds('Folder') ] if items == []: return 'lt100000' return 'lt%s' % str(max(items)+1) Greetings Roman