def _make_index(n):
        'New sequence of indices using the smallest possible datatype'
        if n <= 2**7: return array.array('b', [FREE]) * n       # signed char
        if n <= 2**15: return array.array('h', [FREE]) * n      # signed short
        if n <= 2**31: return array.array('l', [FREE]) * n      # signed long
        return [FREE] * n                                       # python integers
New sequence of indices using the smallest possible datatype
recipes/Python/578375_Proofofconcept_more_spaceefficient/recipe-578375.py