归并排序 python代码

以下是归并排序的 Python 代码：

def merge_sort(arr):
if len(arr) <= 1:
return arr
mid = len(arr) // 2
left = merge_sort(arr[:mid])
right = merge_sort(arr[mid:])
return merge(left, right)

def merge(left, right):
result = []
i = j =
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
result += left[i:]
result += right[j:]
return result

arr = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]
print(merge_sort(arr))