Hi, First of all, thanks for your help.
This is how this ended up: Elements = [ {'Name': 'Access', 'Parent': 'Plot', 'Level': 1.0, 'Height': 3.0, 'Width': 3.0, 'Depth': 3.0}, {'Name': 'Circulation_01', 'Parent': 'Access', 'Level': 1.0, 'Height': 3.0, 'Width': 3.0, 'Depth': 3.0}, {'Name': 'Circulation_02', 'Parent': 'Access', 'Level': 2.0, 'Height': 3.0, 'Width': 3.0, 'Depth': 3.0}, {'Name': 'Circulation_03', 'Parent': 'Access', 'Level': 3.0, 'Height': 3.0, 'Width': 3.0, 'Depth': 3.0}, {'Name': 'Int_Circ_01', 'Parent': 'Circulation_01', 'Level': 1.0, 'Height': 3.0, 'Width': 3.0, 'Depth': 3.0}, {'Name': 'Int_Circ_02', 'Parent': 'Circulation_01', 'Level': 1.0, 'Height': 3.0, 'Width': 3.0, 'Depth': 3.0}, {'Name': 'Int_Circ_03', 'Parent': 'Circulation_02', 'Level': 2.0, 'Height': 3.0, 'Width': 3.0, 'Depth': 3.0}, {'Name': 'Int_Circ_04', 'Parent': 'Circulation_02', 'Level': 2.0, 'Height': 3.0, 'Width': 3.0, 'Depth': 3.0}, {'Name': 'Int_Circ_05', 'Parent': 'Circulation_03', 'Level': 3.0, 'Height': 3.0, 'Width': 3.0, 'Depth': 3.0}, {'Name': 'Int_Circ_06', 'Parent': 'Circulation_03', 'Level': 3.0, 'Height': 3.0, 'Width': 3.0, 'Depth': 3.0} ] # Get Levels List for Element in Elements: Lev_List['Level_%i' % (Element['Level'])] = [] # Append Element to corresponding Level for Element in Elements: Lev_List['Level_%i' % (Element['Level'])].append(Element['Name']) print Lev_List And this is the result: Lev_List = { 'Level_1': ['Access', 'Circulation_01', 'Int_Circ_01', 'Int_Circ_02'], 'Level_2': ['Circulation_02', 'Int_Circ_03', 'Int_Circ_04'], 'Level_3': ['Circulation_03', 'Int_Circ_05', 'Int_Circ_06'] } It works fine, as far as I can tell. I mean, no matter how many 'Levels' it will allways get them right (levels so far are only integers). Probably the first loop is a little redundant, but performance is not one of my concerns now, but in the future the project will not be composed by a handful of spaces, probably by hundreds or more. Regards, Carlos _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor