python之取消嵌套嵌套列表

您好，我想知道如何解除嵌套的嵌套列表。我有:

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

我想看如下:

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

怎么做？

请您参考如下方法:

>>> L = [[[1,2,3]], [[4,5,6]], [[7,8,9]]] 
>>> [x[0] for x in L] 
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]