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

Can you give an example? Something simple, showing what you tried, what you 
expected, and what happened instead.

This may help: http://sscce.org/

Your bug.py file doesn't ever use the result of calling list(), so how do you 
know it changes the value of the parameter?

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nosy: +steven.daprano

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<https://bugs.python.org/issue39110>
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