Python 3-将嵌套结果合并到一个列表中

def flatten(nested_list):
    result = []
    for item in nested_list:
        if isinstance(item, list):
            result.extend(flatten(item))
        else:
            result.append(item)
    return result

nested_list = [[1, 2, 3], [4, [5, 6]], [7, 8, 9]]
flattened_list = flatten(nested_list)
print(flattened_list)

[1, 2, 3, 4, 5, 6, 7, 8, 9]

nested_list = [[1, 2, 3], [4, [5, 6]], [7, 8, 9]]
flattened_list = [item for sublist in nested_list for item in sublist]
print(flattened_list)

[1, 2, 3, 4, 5, 6, 7, 8, 9]