Take elements from a specific part of an array

Question

How can I select and take elements from the third element to the last?

names = [1,2,3,45,12]

check out slicing in the documentation..it's rather simple, if you have a list, you can slice a subset of itself by doing names[start:stop:step], where start=start index, stop=stop index, step=the step to take between start and stop, note python will include up to but not including the stop index..here is a good question that covers this https://stackoverflow.com/questions/509211/understanding-slice-notation — Derek Eden, Apr 24 '20 at 01:46

Novak254 · Accepted Answer · 2020-04-24T01:46:39.500

3

You can slice an array from a certain index to the end or to another position as shown below

new_names = names[2:]

The above will slice from third to the last index

edited Apr 24 '20 at 01:46

answered Apr 24 '20 at 01:39

Novak254

this will slice from the 3rd index position..which is actually the 4th element – Derek Eden Apr 24 '20 at 01:42
I have fixed it @DerekEden – Novak254 Apr 24 '20 at 01:47

Chrissu · Answer 2 · 2020-04-24T04:53:14.097

names = [1,2,3,45,12]

You can access only certain parts of an array with slicing:

slicednames = names[2:]
[3,45,12]

This will save all elements from names to the new array, starting with the 3rd element.

If you put a second number in, you can specify the last element that is taken from the array as well:

slicednames = names[2:4]
[3,45]

This would copy only the elements 3 and 4. (The end limit is excluded, while the starting index is included.

If there is another colon followed by another number, its the size of the steps.

slicednames = names[::2]
[1,3,12]

So this would copy every second element of the array. (Starting with the first one, if not specified otherwise)

You should read about slicing, it is a basic and very useful tool to have in your belt.

2 Answers2