> Any ideas? how about list comprehension (should actually work even if there is an empty sub-list): >>> spam = [[1,2,3],[4,5,6],[7,8,9],[10,11,12]] >>> [parrot for egg in spam for parrot in egg] [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12] -m