Equivalent of Numpy.argsort() in basic python? [duplicate]

Question

is there a builtin function of Python that does on python.array what argsort() does on a numpy.array?

Answer 1

There is no built-in function, but it's easy to assemble one out of the terrific tools Python makes available:

def argsort(seq):     # http://stackoverflow.com/questions/3071415/efficient-method-to-calculate-the-rank-vector-of-a-list-in-python     return sorted(range(len(seq)), key=seq.__getitem__)  x = [5,2,1,10]  print(argsort(x)) # [2, 1, 0, 3] 

It works on Python array.arrays the same way:

import array x = array.array('d', [5, 2, 1, 10]) print(argsort(x)) # [2, 1, 0, 3]