列表理解的结果是平面列表 [英] flat list as a result of list comprehension

问题描述

我使用列表理解的方式是，对于每个元素，我有2个结果值:

I use list comprehension in such a way that for each element I have 2 resulting values:

my_list = [10,20,30]
res_list = [ (x*2, x*3) for x in my_list ]
res_list # [(20, 30), (40, 60), (60, 90)]

但是我需要一个扁平化的列表，所以我必须执行另一种理解:

But I need to have a flatten list, so I have to perform another comprehension:

res_list_1 = [yy for xx in res_list for yy in xx]
res_list_1 # [20, 30, 40, 60, 60, 90]

有什么方法可以避免这种情况，并在第一次理解时直接获得平坦的res_list?

Is there any way to avoid this and get flat res_list directly on the first comprehension?

推荐答案

将tuple放在末尾:

res_list_1 = [item for object in my_list for item in (object*2, object*3)]

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