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Created on 2020-11-23 22:06 by void4buser, last changed 2022-04-11 14:59 by admin. This issue is now closed.
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| File name | Uploaded | Description | Edit | |
| bug.png | void4buser, 2020-11-23 22:06 | Screenshot about the bug | ||
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| msg381698 - (view) | Author: void abuser (void4buser) | Date: 2020-11-23 22:06 | |
So basically the bug that I found was about adding a number to a sub-list. If you declare li1 as li1=[[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0]] in the code below then the code is working as it should do. Although if you create the list called li1 with the same way how I did in the code below (which has the same outcome in terms of looking at that 2 dimension list) then the output is different and in fact false. The code: li1=[[0]*4]*4 for x in range(4): li1[0][1]+=1 print(li1) Expected behavior Expected output: [[0, 1, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]] [[0, 2, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]] [[0, 3, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]] [[0, 4, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]] The output that I got: [[0, 1, 0, 0], [0, 1, 0, 0], [0, 1, 0, 0], [0, 1, 0, 0]] [[0, 2, 0, 0], [0, 2, 0, 0], [0, 2, 0, 0], [0, 2, 0, 0]] [[0, 3, 0, 0], [0, 3, 0, 0], [0, 3, 0, 0], [0, 3, 0, 0]] [[0, 4, 0, 0], [0, 4, 0, 0], [0, 4, 0, 0], [0, 4, 0, 0]] |
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| msg381699 - (view) | Author: Eric V. Smith (eric.smith) *  |
Date: 2020-11-23 22:41 | |
This isn't a bug. All of your nested lists are the same. See for example: https://stackoverflow.com/questions/44195396/initializing-an-m-x-n-array-of-0s-in-python |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:59:38 | admin | set | github: 86615 |
| 2020-11-23 22:41:45 | eric.smith | set | status: open -> closed components: - Regular Expressions nosy: + eric.smith messages: + msg381699 resolution: not a bug stage: resolved |
| 2020-11-23 22:06:39 | void4buser | create | |