On Sep 2, 8:04 am, Mike P <[EMAIL PROTECTED]> wrote: > Hi All, > > I have two dictionaries e.g > dict1 = {123:3,234:5,456:3} > dict2 = {123:4,157:2,234:5,456:3,567:2} > > I want to merge these two dictionaries together so i have a resultant > dictionary of: > > dict3 = {123:[4,3],157:[2,0],234:[5,5],456:[3,3],567:[2,0]} > > As later on i want to write a csv file that would have the form > > id var1 var2 > 123 4 3 > 157 2 0 > > i looks like the dict.update looks almost there but i can't get it to > work properly, can anyone offer any advise?
The update() method is not quite right for your purposes. But a simple generator expression will do the trick: >>> dict((k, [v, dict1.get(k, 0)]) for k, v in dict2.items()) {456: [3, 3], 234: [5, 5], 123: [4, 3], 157: [2, 0], 567: [2, 0]} Raymond -- http://mail.python.org/mailman/listinfo/python-list