As the concat node is, it converts the input to a string and then loop the character and adds them.     #inputs     stringIn = str(self.Params.stringIn.value)          #script     newString = ''     for s in stringIn:         newString = newString + s          #outputs     self.Params.stringOut.value = newString I am not sure but I would expect from this node, it should do something like this: #inputs stringIn = self.Params.stringIn.value #script newString = '' for s in stringIn: