TypeError: tranche indices doivent être des entiers ou Aucun, ou avoir un __index__ méthode

Lors de l'exécution du code dans le vide donne l'erreur suivante:

Traceback (most recent call last):   File "C:/Python34/inversion3.py",
line 44, in <module>
    nInversions.inversionMergeSort(m)   File "C:/Python34/inversion3.py", line 16, in inversionMergeSort
     left = m[0:half] TypeError: slice indices must be integers or None or have an __index__ method

CODE:-

from collections import deque
m = []
f = open("IntegerArray.txt")
for line in f:
m.append(int(line))
class InversionCount:
def __init__(self, n):
self.n = n
def inversionMergeSort(self, m):
if len(m) <= 1:
return m
half = len(m)/2
left = m[0:half]
right = m[half:]
left = self.inversionMergeSort(left)
right = self.inversionMergeSort(right)
return self.inversionSort(left, right)
def inversionSort(self, left, right):
leftQueue = deque(i for i in left)
rightQueue = deque(j for j in right)
orderedList = []
while len(leftQueue) > 0 or len(rightQueue) > 0:
if len(leftQueue) > 0 and len(rightQueue) > 0:
if leftQueue[0] <= rightQueue[0]:
orderedList.append(leftQueue[0])
leftQueue.popleft()
else:
orderedList.append(rightQueue[0])
self.n += len(leftQueue)
rightQueue.popleft()
elif len(leftQueue) > 0:
orderedList.append(leftQueue[0])
leftQueue.popleft()
elif len(rightQueue) > 0:
orderedList.append(rightQueue[0])
rightQueue.popleft()
return orderedList
nInversions = InversionCount(0)
nInversions.inversionMergeSort(m)
print (nInversions.n)