Karthikeyan Singaravelan <tir.kar...@gmail.com> added the comment:

You are passing a reference to the list so changes in Flash are made to the 
actual variable. Using cards.copy() instead of cards passes a copy of the list 
and hence modifications inside the function won't affect the original list.

This is not a bug in CPython and it's more suited python-tutor mailing list. 
Also in future bug reports please paste the program and output than images.

Thanks

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nosy: +xtreak

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<https://bugs.python.org/issue36741>
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