Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:

This is not a bug, it is part of the design of the language. Assignment in 
Python does not make a copy of lists, or any other object. In your sample code, 
p and l are two names for the same list, like "Devor Blake Daniels" and 
"dev40573" are two names for the same person (you).

You can use slicing to make a copy of the list, or the copy module, or the list 
constructor.

I don't understand your comment "when dealing with lists like s[][],slicing 
does not work".

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nosy: +steven.daprano

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38458>
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