lista = [4, 2, 1, 3]
listb = lista
lista.sort()
print lista
print listb

print id(lista)
print id(listb)

import numpy as np

def get_sorted_cumsum(numbers):
    numbers.sort()
    cum_sum = np.cumsum(numbers)
    return cum_sum

mynumbers = [5, 2, 1, 3, 3, 2, 5, 4, 1, 1]
sorted_cumsum = get_sorted_cumsum(mynumbers)
print mynumbers

lista = [4, 2, 1, 3]
listb = lista[:]
lista.sort()
print lista
print listb