List of lists changes reflected across sublists unexpectedly

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Music by Eric Matyas
https://www.soundimage.org
Track title: City Beneath the Waves Looping

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Chapters
00:00 Question
00:29 Accepted answer (Score 769)
02:59 Answer 2 (Score 173)
03:24 Answer 3 (Score 71)
04:16 Answer 4 (Score 48)
04:57 Thank you

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Full question
https://stackoverflow.com/questions/2401...

Answer 1 links:
[Live visualization]: http://pythontutor.com/visualize.html#co...
[image]: https://i.stack.imgur.com/AE8xf.png

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Tags
#python #list #nestedlists #mutable

#avk47