John Cena <crazygu...@gmail.com> added the comment:

You are actually creating 4 references to the same list(See the ending *4). 
This is how python behaves. See the below link as well

https://stackoverflow.com/questions/240178/list-of-lists-changes-reflected-across-sublists-unexpectedly

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nosy: +crazyguyx4

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<https://bugs.python.org/issue43581>
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