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from __future__ import print_function

import numpy as np

import datetime

def datestr2num(s):

return datetime.datetime.strptime(s, "%d-%m-%Y").toordinal()

dates,closes=np.loadtxt('AAPL.csv', delimiter=',', usecols=(1, 6), converters={1:datestr2num}, unpack=True)

indices = np.lexsort((dates, closes))

print("Indices", indices)

print(["%s %s" % (datetime.date.fromordinal(int(dates[i])), closes[i]) for i in indices])