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lst = [['a', 'b', 'c'], ['d', 'e', 'f', 'g'], ['o'], ['i', 'j', 'k', 'l', 'm'], ['n', 'p'], ['h']] lst.sort(key = len) print(lst) ''' run: [['o'], ['h'], ['n', 'p'], ['a', 'b', 'c'], ['d', 'e', 'f', 'g'], ['i', 'j', 'k', 'l', 'm']] '''