How to move values stored in variables to the left with the first value to move to the back

Question

I have 4 variables (1,2,3,4) and I have to write a Python code to move the values stored in those variables to the left, with the leftmost value ending up in the rightmost variable enter image description here

Please consider validating one of the proposed answer if you considered it useful ;) — Victor Deleau, Nov 11 '19 at 00:35

Alec McKay · Answer 1 · 2019-11-09T22:28:08.797

1

lis = [1,2,3,4]

lis = lis[1:] + [lis[0]]

A good description of slicing can be found here

edited Nov 09 '19 at 22:28

answered Nov 09 '19 at 22:15

Alec McKay

135
7

score 0 · Accepted Answer · answered Nov 09 '19 at 22:15

0

You can create a new list and copy values at the right place:

previous_list = [1,2,3,4]
new_list = []

for i in range(1, len(previous_list)):
    new_list.append(previous_list[i])

new_list.append(previous_list[0])

print(new_list)

answered Nov 09 '19 at 22:15

Victor Deleau

875
5
17

score 0 · Answer 3 · answered Nov 09 '19 at 22:16

0

Try:

x=[1,2,3,4]

y=(x+x)[1:len(x)+1]
print(y)

Output:

[2, 3, 4, 1]

[Program finished]

answered Nov 09 '19 at 22:16

Grzegorz Skibinski

12,624
2
11
34

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I would be interested to know how this works exactly – Victor Deleau Nov 09 '19 at 22:21
1

```(x+x)``` duplicates ```x``` so we have: ```[1,2,3,4,1,2,3,4]``` then iterating from 1 till 5 (```len(X)+1```) returns 3 elements from first ```x``` and 1 from the second. – Grzegorz Skibinski Nov 09 '19 at 22:26
1

I get it ! Interesting way of solving the problem – Victor Deleau Nov 09 '19 at 22:27

How to move values stored in variables to the left with the first value to move to the back

3 Answers3