def mergesort(L):
print L
if len(L) < 2:
return L[:]
else:
middle = len(L) / 2
left = mergesort(L[:middle])
right = mergesort(L[middle:])
together = merge(left, right)
print 'merged', together
return together
def merge(left, right):
result = []
i, j = 0, 0
while i < len(left) and j < len(right):
if left[i] < right[j]:
result.append(left[i])
i += 1
else:
result.append(right[j])
j += 1
if i < len(left):
result += left[i:]
else:
result += right[j:]
return result
