Python：列表理解列表
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Python: List comprehension list of lists
提问by Jean-Luc
I have a list of lists, and would like to use list comprehension to apply a function to each element in the list of lists, but when I do this, I end up with one long list rather than my list of lists.
我有一个列表列表，并且想使用列表理解将函数应用于列表列表中的每个元素，但是当我这样做时，我最终得到一个长列表而不是我的列表列表。
So, I have
所以我有
x = [[1,2,3],[4,5,6],[7,8,9]]
[number+1 for group in x for number in group]
[2, 3, 4, 5, 6, 7, 8, 9, 10]
But I want to get
但我想得到
[[2, 3, 4], [5, 6, 7], [8, 9, 10]]
How do I go about doing this?
我该怎么做？
采纳答案by Booster
Use this:
用这个：
[[number+1 for number in group] for group in x]
Or use this if you know map:
或者，如果您知道地图，请使用它：
[map(lambda x:x+1 ,group) for group in x]
回答by Shirutzen
lista = [[i+3*(j-1) for i in range(1,4)] for j in range(1,4)]
print(lista)
# outputs [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
