Ezio Melotti <ezio.melo...@gmail.com> added the comment:

See also 
https://docs.python.org/3/faq/programming.html#why-did-changing-list-y-also-change-list-x

You can use the builtin function id() to see the id of the lists, and verify 
whether they refer to the same object or not.

----------
nosy: +ezio.melotti
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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<https://bugs.python.org/issue39368>
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