Flatten a list of lists in Python
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lst = [[1, 2, 3, 4], [5, 6, 7, 8]]; print [x for y in lst for x in y] #[1, 2, 3, 4, 5, 6, 7, 8]
lst = [[1, 2, 3, 4], [5, 6, 7, 8]]; print [x for y in lst for x in y] #[1, 2, 3, 4, 5, 6, 7, 8]