About list slicing in Python

Asked Mar 23 '21 at 22:56

Active Mar 24 '21 at 08:50

Viewed 35 times

I have learned Python for about 4 months, I thought I know every basics now. But currently I accidently tried a simple python expression, and the result is out of my expectation.

for example:

test = [1,2,3,4]

test[0:-1:-1]

and the result is an empty list([]).

However, my expected result is [3,2,1] for "test[::-1]" will output "[4,3,2,1]".

Can anyone tell me why?

edited Mar 24 '21 at 08:46

Anurag Dabas

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asked Mar 23 '21 at 22:56

JadeChest

1

Perhaps this can provide insight: https://stackoverflow.com/questions/41783307/understanding-negative-steps-in-list-slicing – nullforce Mar 23 '21 at 23:10
Besides reading the prev. post - you could try this: ``` test[-2::-1]``` -> [3, 2, 1] – Daniel Hao Mar 24 '21 at 01:57
"Stepping backwards from the first index to the last"… how should that produce any output? – deceze Mar 24 '21 at 08:51

About list slicing in Python

0 Answers0