split list elements into sub-elements in pandas dataframe这个非常接近--但我需要把它们放到一个子列表中，而不是拆分所有的元素并放入一个列表中。
df：
col1
['this is list 1', 'this is list 2', 'this is another list 3']
['this is list 1', 'this is list 2', 'this is another list 3']
['this is list 1', 'this is list 2', 'this is another list 3']我正在尝试使dataframe列看起来像这样：
col1
[['this', 'is', 'list', '1'], ['this', 'is', 'list', '2'], ['this', 'is', 'another', lis't', '3']]
[['this', 'is', 'list', '1'], ['this', 'is', 'list', '2'], ['this', 'is', 'another', lis't', '3']]
[['this', 'is', 'list', '1'], ['this', 'is', 'list', '2'], ['this', 'is', 'another', lis't', '3']]基本上，将列表中的元素拆分为子列表，其中每个单词都是子列表中的元素/项，所有这些都在pandas df列中
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