[Steven D'Aprano]
> I recently needed to write a function to generate a rank table from a
> list. That is, a list of ranks, where the rank of an item is the position
> it would be in if the list were sorted:
>
> alist = list('defabc')
> ranks = [3, 4, 5, 0, 1, 2]
. . .
> def rank(sequence):
> table = [None] * len(sequence)
> for j, idx in enumerate(index(sequence)):
> table[idx] = j
> return table
FWIW, you can do ranking faster and more succinctly with the sorted()
builtin:
def rank(seq):
return sorted(range(len(seq)), key=seq.__getitem__)
Raymond
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