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lst1 = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110] lst2 = [30, 90, 100, 80] dic = dict(zip(lst1, range(len(lst1)))) indexes = [dic[val] for val in lst2] print(indexes ) ''' run: [2, 8, 9, 7] '''