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I have a list that holds several sublist, each one of them with a given number of elements inside. I need to move all elements inside all sublists into another list, ie: remove the separation among elements imposed by the sublists.

This is a MWE if what I mean:

a = [[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16]], [[17, 18, 19, 20], [21, 22, 23, 24]], [[25, 26, 27, 28], [26, 30, 31, 32], [33, 34, 35, 36]]]

b = []
    for elem in a:
        for item in elem:
            b.append(item)

which results in:

[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16], [17, 18, 19, 20], [21, 22, 23, 24], [25, 26, 27, 28], [26, 30, 31, 32], [33, 34, 35, 36]]

I'm sure there's a more elegant and simpler way to do this in python.

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2 回答 2

2

使用itertools.chain.from_iterable：

>>> from itertools import chain
>>> list(chain.from_iterable(a))
[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16], [17, 18, 19, 20], [21, 22, 23, 24], [25, 26, 27, 28], [26, 30, 31, 32], [33, 34, 35, 36]]

时序对比：

在此处输入图像描述

于 2013-11-01T17:31:06.813 回答
2

尝试这个：

[item for sublist in a for item in sublist]
于 2013-11-01T17:31:17.223 回答