I have a list in python, eg. [1,2,3,4,5,6,7,8,9,10,11,12]
I want to make a new list with only the 4. element from the right? .. how to do that, eg. with a one liner.
eq. to .. [4,8,12]
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like this: a = [b[3]] – Ann Zen Jun 11 '20 at 12:53
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2You mean, each 4th element? Like this `my_list[3::4]`? – bereal Jun 11 '20 at 12:53
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1@bereal - they say from the right. Depending on number of elements it may not start at 3 – buran Jun 11 '20 at 12:56
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@buran good point. – bereal Jun 11 '20 at 12:57
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arhh .. rather : my_list[::4] .. thanks. – pkdkk Jun 11 '20 at 12:57
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@pkdkk that will return `[1, 5, 9]`. – bereal Jun 11 '20 at 12:59
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Humm, not what i expected.. my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]. i need a list to be [2, 6,10,14] – pkdkk Jun 11 '20 at 13:01
2 Answers
2
You can do it simply like so in one line: (where a is your list)
print(a[-1::-4][::-1])
Sahith Kurapati
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foo = [1,2,3,4,5,6,7,8,9,10,11,12]
print(foo[-1::-4])
output
[12, 8, 4]
reverse it, if the order is important
buran
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