Variables in python are just pointers, as far as I know.
Based on this rule, I can assume that the result for this code snippet:
We call them references. They work like this
i = 5 # create int(5) instance, bind it to i j = i # bind j to the same int as i j = 3 # create int(3) instance, bind it to j print i # i still bound to the int(5), j bound to the int(3)
Small ints are interned, but that isn't important to this explanation
i = [1,2,3] # create the list instance, and bind it to i j = i # bind j to the same list as i i = 5 # change the first item of i print j # j is still bound to the same list as i