CODEWITHSUNDEEP
pythonlist
TIMEX
TIMEX

Reputation: 271674

How to slice a list in Python

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?

Upvotes: 68

Views: 203035

Answers (4)

warvariuc
warvariuc

Reputation: 59594

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]
>>>

Upvotes: 46

user153498
user153498

Reputation: 

l = [4,76,2,8,6,4,3,7,2,1]
l = l[:5]

Upvotes: 1

sepp2k
sepp2k

Reputation: 370112

>>> [1,2,3,4,5,6,7,8,9][:5]
[1, 2, 3, 4, 5]
>>> [1,2,3][:5]
[1, 2, 3]

Upvotes: 1

Mark Rushakoff
Mark Rushakoff

Reputation: 258148

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]

Upvotes: 120

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