[Python] Why does Python Tutor draw strings and integers in a list without a pointer although...

I read that "everything is a reference in python".

Though, when I run in Python Tutor the following code:

lst = [1,[1]]


lst[1] is drawn as an arrow pointing to a list while lst[0] is just the number 1.

I also understand that what makes the difference is that lst[0] is immutable and lst[1] is mutable. I still don't get how to explain the drawing in Python Tutor, or any other explanation.

The drawing in Python Tutor looks as if the number itself is saved in lst[0] and not a reference, but I guess this is wrong because "everything in python is a reference".

How can we explain the drawing otherwise? Is the drawing in Python Tutor misleading and there is actually an address stored in lst[0]?

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