Kapil Thangavelu wrote: > return map( (lambda x,y:(x,y)), l1, l2) You can replace this with return map(None, l1, l2) You can see why via print map.__doc__ Cheers, Nils -- nika@acm.org | nika@kassube.de (preferred) 4kassube@informatik.uni-hamburg.de | nika@on-luebeck.de