import numpy as np

l = [0,-8,1,10,13,2]

a = np.argsort(l)
# returns [1 0 2 5 3 4], the order required to sort l

# init new list to zero
pos = [0 for x in range(0,len(l))]

# scatter http://en.wikipedia.org/wiki/Gather-scatter_(vector_addressing)
for i in range(0,len(l)):
        pos[a[i]] = i

print pos
# prints [1, 0, 2, 4, 5, 3], i.e. each original indexes new position in the sorted array

import numpy as np

l = np.array([0,-8,1,10,13,2])

def myargsort(numbers):
  tuples = enumerate(numbers) # returns iterable of index,value
  return np.array([idx for idx,val in sort(tuples,key = lambda pair: pair[1])])

print(l)
print(myargsort(l))
print(np.argsort(l))