Insertion sort (Python)

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snippet isolated from Quicksort (Python, arrays) cf Insertion sort (Python, arrays) 

def insertionSort(a, start, end):
    for i in xrange(start, end + 1):
        # Insert a[i] into the sorted sublist
        v = a[i]
        for j in xrange(i-1, -1, -1):
            if a[j] <= v:
                a[j + 1] = v
                break
            a[j + 1] = a[j]
        else:
            a[0] = v
    return a
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