如何重复嵌套列表的元素？

Question

我有一个列表列表如下：

original = [['best', 'movie', 'ever', '!'],
            ['i', 'love', 'this', 'actor', '!'],
            ['season','2']]

我想创建一个新列表，其中每个元素在原始列表中重复 3 次。期望的结果是：

new_list = [['best', 'movie', 'ever', '!'],
            ['best', 'movie', 'ever', '!'],
            ['best', 'movie', 'ever', '!'],
            ['i', 'love', 'this', 'actor', '!'],
            ['i', 'love', 'this', 'actor', '!'],
            ['i', 'love', 'this', 'actor', '!'],
            ['season','2'],
            ['season','2'],
            ['season','2']]

我试过这个：

new_list = [i*3 for i in original]

它returns:

[['best','movie','ever','!','best','movie','ever','!','best','movie','ever','!'],
 ['i','love','this','actor','!','i','love','this','actor','!','i','love','this','actor','!'],
 ['season', '2', 'season', '2', 'season', '2']]

如何更正代码以获得所需的输出？

Answer 1

只需使用：

[x for x in original for _ in range(3)]

不过，您可能需要使用：

[x.copy() for x in original for _ in range(3)]

如何重复嵌套列表的元素？

how to repeat elements of nested list?

python

list

nested-lists