python how to slice lists

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Katelynn
28 Jun 2016
1# Basic syntax:
2your_list[start:stop:step]
3
4# Note, Python is 0-indexed
5# Note, start is inclusive but stop is exclusive
6# Note, if you leave start blank, it defaults to 0. If you leave stop
7# 	blank, it defaults to the length of the list. If you leave step
8# 	blank, it defaults to 1.
9# Note, a negative start/stop refers to the index starting from the end
10# 	of the list. Negative step returns list elements from right to left 
11
12# Example usage:
13your_list = [0, 1, 2, 3, 4, 5]
14your_list[0:5:1]
15--> [0, 1, 2, 3, 4] # This illustrates how stop is not inclusive
16
17# Example usage 2:
18your_list = [0, 1, 2, 3, 4, 5]
19your_list[::2] # Return list items for even indices
20--> [0, 2, 4]
21
22# Example usage 3:
23your_list = [0, 1, 2, 3, 4, 5]
24your_list[1::2] # Return list items for odd indices
25--> [1, 3, 5]
26
27# Example usage 4:
28your_list = [0, 1, 2, 3, 4, 5]
29your_list[4:-6:-1] # Return list items from 4th element from the left to 
30#	the 6th element from the right going from right to left
31--> [4, 3, 2, 1]
32# Note, from the right, lists are 1-indexed, not 0-indexed 
Marvin
25 Oct 2018
1a = [1,2,3,4,5]
2a[m:n] # elements grrater than equal to m and less than n
3a[1:3] = [2,3]
Antonio
15 May 2020
1# [start:stop:step]
2# for example ...
3l = [1, 2, 3, 4, 5]
4l[1:4] # elements from 1 (inclusive) to 4 (exclusive)
5l[2:5:2] # elements from 2 (inclusive) to 5 (exclusive) going up by 2
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