Eric V. Smith <e...@trueblade.com> added the comment:

Your example is too complex to work through in my head, but I suspect this is 
the issue you're seeing: 
https://docs.python.org/3/faq/programming.html#why-did-changing-list-y-also-change-list-x

In any event, this is almost certainly not a bug in Python, but rather in your 
code. You might want to ask this question on the python-list mailing list 
https://mail.python.org/mailman/listinfo/python-list or on Stack Overflow, 
which are more appropriate venues than the bug tracker.

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<https://bugs.python.org/issue41827>
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