[Python] Lists in Python returning unexpected

I am currently studying Lists in Python and came across below. Shouldn't running List1 at the very end return [2,3,'append me!']? Isn't running popped_item=list1.pop() independent of/different from running list1.pop() and then list1

list1=[2, 3, 'append me!'], popped_item = list1.pop(), popped_item, 'append me!', list1, [2, 3]

Because, if I run something similar as below. I get 'Sunny Side' and not 'SUNNY SIDE' at the end.

Name='Sunny Side', Name, 'Sunny Side', YY=Name.upper(), YY, 'SUNNY SIDE', Name, 'Sunny Side'

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