python - How to convert a list into a list of lists in python

Question

Here is an example of a list that I would like to convert into a list of lists in python:

p=[1,2,3,4]

I wrote the following code to address the problem:

u=[]
v=[x for x in p]
u.append(v)

my result: [[1,2,3,4]]

Result I would like to have: **[[1],[2],[3],[4]]**

Any suggestions? thanks.

Answer 1

只需对您的列表理解做一个小调整，然后将x括号括起来以将每个元素放入列表中。

>>> p = [1, 2, 3, 4]
>>> v = [[x] for x in p]
>>> v
[[1], [2], [3], [4]]

Answer 2

你想要这样的东西：

u = [[x] for x in p]

Answer 3

正如其他答案所描述的那样，列表理解是一种简单的方法，但还有其他选择

>>> map(list,zip(p))
[[1], [2], [3], [4]]

或者

>>> from itertools import izip
>>> map(list,izip(p))
[[1], [2], [3], [4]]