Python在子列表中查找列表长度 [英] Python find list lengths in a sublist

问题描述

我正在尝试找出如何获取特定列表中包含的每个列表的长度.例如:

I am trying to find out how to get the length of every list that is held within a particular list. For example:

a = []
a.append([])
a[0].append([1,2,3,4,5])
a[0].append([1,2,3,4])
a[0].append([1,2,3])

我想运行以下命令:

len(a[0][:]) 

这将输出我想要的答案，该答案是长度[5,4,3]的列表.该命令显然无效，我尝试过的其他命令也无效.请帮忙！

which would output the answer I want which is a list of the lengths [5,4,3]. That command obviously does not work, and neither do a few others that I've tried. Please help!

推荐答案

[len(x) for x in a[0]]吗?

>>> a = []
>>> a.append([])
>>> a[0].append([1,2,3,4,5])
>>> a[0].append([1,2,3,4])
>>> a[0].append([1,2,3])
>>> [len(x) for x in a[0]]
[5, 4, 3]

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