So I have this list
X = [[1,2,3],[1,2,3],[1,2,3]]
How can I access all the last elements like Y = [3,3,3]?
Y=X[0:2][2] doesn't seem to work
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4 Answers
I think a list comprehension would be the easiest way to do this. https://docs.python.org/2/tutorial/datastructures.html#list-comprehensions
Y = [i[-1] for i in X]
The -1 will get the last element of the lists. but this can be changed to get any element from these lists.
1 Comment
Chris
I up voted your answer, but your code will break if the sub-list in the OP's list are greater than three elements. Instead of using "hard-coding" to get the last element, use
i[-1] to always get the last element.Use [-1] to acces last item in list.
x_last = [i[-1] for i in X]
Comments
zip is an alternative:
>>> X = [[1,2,3],[1,2,3],[1,2,3]]
>>> list(list(zip(*X))[-1])
[3, 3, 3]
>>>
Comments
Y = [m[-1] for m in X]
The index -1 means the last element of a list.
2 Comments
Mad Physicist
Triple ticks don't work on SO unfortunately. You have to indent everything by four spaces to get the same effect.
Kingname
@MadPhysicist What are you saying about?