How to slice a list in Python
Question:
Suppose I have a list with X elements
[4,76,2,8,6,4,3,7,2,1...]
I’d like the first 5 elements. Unless it has less than 5 elements.
[4,76,2,8,6]
How to do that?
Answers:
l = [4,76,2,8,6,4,3,7,2,1]
l = l[:5]
You just subindex it with [:5] indicating that you want (up to) the first 5 elements.
>>> [1,2,3,4,5,6,7,8][:5]
[1, 2, 3, 4, 5]
>>> [1,2,3][:5]
[1, 2, 3]
>>> x = [6,7,8,9,10,11,12]
>>> x[:5]
[6, 7, 8, 9, 10]
Also, putting the colon on the right of the number means count from the nth element onwards — don’t forget that lists are 0-based!
>>> x[5:]
[11, 12]
>>> [1,2,3,4,5,6,7,8,9][:5]
[1, 2, 3, 4, 5]
>>> [1,2,3][:5]
[1, 2, 3]
To trim a list in place without creating copies of it, use del:
>>> t = [1, 2, 3, 4, 5]
>>> # delete elements starting from index 4 to the end
>>> del t[4:]
>>> t
[1, 2, 3, 4]
>>> # delete elements starting from index 5 to the end
>>> # but the list has only 4 elements -- no error
>>> del t[5:]
>>> t
[1, 2, 3, 4]
>>>
Suppose I have a list with X elements
[4,76,2,8,6,4,3,7,2,1...]
I’d like the first 5 elements. Unless it has less than 5 elements.
[4,76,2,8,6]
How to do that?
l = [4,76,2,8,6,4,3,7,2,1]
l = l[:5]
You just subindex it with [:5] indicating that you want (up to) the first 5 elements.
>>> [1,2,3,4,5,6,7,8][:5]
[1, 2, 3, 4, 5]
>>> [1,2,3][:5]
[1, 2, 3]
>>> x = [6,7,8,9,10,11,12]
>>> x[:5]
[6, 7, 8, 9, 10]
Also, putting the colon on the right of the number means count from the nth element onwards — don’t forget that lists are 0-based!
>>> x[5:]
[11, 12]
>>> [1,2,3,4,5,6,7,8,9][:5]
[1, 2, 3, 4, 5]
>>> [1,2,3][:5]
[1, 2, 3]
To trim a list in place without creating copies of it, use del:
>>> t = [1, 2, 3, 4, 5]
>>> # delete elements starting from index 4 to the end
>>> del t[4:]
>>> t
[1, 2, 3, 4]
>>> # delete elements starting from index 5 to the end
>>> # but the list has only 4 elements -- no error
>>> del t[5:]
>>> t
[1, 2, 3, 4]
>>>