def merge(a, b): c = [] h = j = 0 while j < len(a) and h < len(b): if a[j] < b[h]: c.append(a[j]) j += 1 else: c.append(b[h]) h += 1 if j == len(a): for i in b[h:]: c.append(i) else: for i in a[j:]: c.append(i) return c def merge_sort(lists): if len(lists) <= 1: return lists middle = len(lists)/2 left = merge_sort(lists[:middle]) right = merge_sort(lists[middle:]) return merge(left, right) if __name__ == '__main__': a = [4, 7, 8, 3, 5, 9] print merge_sort(a)
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