在Python中使用List Comprehension映射嵌套列表? [英] Mapping a nested list with List Comprehension in Python?

问题描述

我有以下代码，可用于在Python中映射嵌套列表以生成具有相同结构的列表.

I have the following code which I use to map a nested list in Python to produce a list with the same structure.

>>> nested_list = [['Hello', 'World'], ['Goodbye', 'World']]
>>> [map(str.upper, x) for x in nested_list]
[['HELLO', 'WORLD'], ['GOODBYE', 'WORLD']]

这可以单独使用列表理解来完成(不使用map函数)吗?

Can this be done with list comprehension alone (without using the map function)?

推荐答案

对于嵌套列表，您可以使用嵌套列表理解:

For nested lists you can use nested list comprehensions:

nested_list = [[s.upper() for s in xs] for xs in nested_list]

我个人认为map在这种情况下会更干净，尽管我几乎总是更喜欢列表理解.所以这真的是您的电话，因为任何一个都可以.

Personally I find map to be cleaner in this situation, even though I almost always prefer list comprehensions. So it's really your call, since either will work.

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