python: using list slice as target of a for loop

Question

I found this code snippet to be very interesting.

a = [0, 1, 2, 3]

for a[-1] in a:
    print(a)

Output is as follows:

[0,          


        

Answer 1

What happens is

         0 SETUP_LOOP              24 (to 26)
          2 LOAD_GLOBAL              0 (a)
          4 GET_ITER
    >>    6 FOR_ITER                16 (to 24)
          8 LOAD_GLOBAL              0 (a)     //ARRAY (TOS1)
         10 LOAD_CONST               2 (-1)    //DEST (TOS)
         12 STORE_SUBSCR                       //ARRAY[DEST] = TOS2*
        14 LOAD_GLOBAL              1 (print)
         16 LOAD_GLOBAL              0 (a)
         18 CALL_FUNCTION            1
         20 POP_TOP
         22 JUMP_ABSOLUTE            6
    >>   24 POP_BLOCK
    >>   26 LOAD_CONST               0 (None)
         28 RETURN_VALUE

*So if someone could clarify that TOS2 is actually the 'visited' value of the ARRAY?