Issue 31063: List Comprehension Bug (original) (raw)

Issue31063

Created on 2017-07-28 05:10 by hyunjaemoon, last changed 2022-04-11 14:58 by admin. This issue is now closed.

Messages (3)
msg299363 - (view)	Author: Hyun Jae Moon (hyunjaemoon)	Date: 2017-07-28 05:10
Please check the photo attached. This was tested on Python 3.6.0. It seems that there is a bug in list comprehension. The list b should include 84 as well according to the code I wrote. I believe this is a quite severe bug. Thank you very much.
msg299364 - (view)	Author: Tim Peters (tim.peters) *	Date: 2017-07-28 05:27
This isn't a bug. 84 appears twice in the list, the first time at index 9. The .index() method finds the first (leftmost; smallest index) occurrence. Since 9 isn't even, the `if` test isn't satisfied, so 84 does not appear in the result.
msg299365 - (view)	Author: Steven D'Aprano (steven.daprano) *	Date: 2017-07-28 05:39
In the future, please do not post screenshots, please copy and paste the text. Screenshots are hard or impossible for the blind or visually impaired to see, but they can use a screen reader to work with text.