实现合并排序时出错[ AttributeError：'int‘对象没有属性'data’]

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

def merge(left, right):
    merged = []
    i = j = 0
    
    while i < len(left) and j < len(right):
        if left[i] < right[j]:
            merged.append(left[i])
            i += 1
        else:
            merged.append(right[j])
            j += 1
    
    while i < len(left):
        merged.append(left[i])
        i += 1
    
    while j < len(right):
        merged.append(right[j])
        j += 1
    
    return merged

# 示例用法
arr = [5, 3, 8, 2, 1, 7, 6, 4]
sorted_arr = merge_sort(arr)
print(sorted_arr)