0 LOAD_CONST               1 ('')
      2 STORE_FAST               1 (o)

      4 SETUP_LOOP              56 (to 62)
      6 LOAD_GLOBAL              0 (enumerate)
      8 LOAD_FAST                0 (flag)
     10 CALL_FUNCTION            1
     12 GET_ITER
>>   14 FOR_ITER                44 (to 60)
     16 UNPACK_SEQUENCE          2
     18 STORE_FAST               2 (i)
     20 STORE_FAST               3 (b)

     22 LOAD_GLOBAL              1 (ord)
     24 LOAD_FAST                3 (b)
     26 CALL_FUNCTION            1
     28 STORE_FAST               3 (b)

     30 LOAD_FAST                3 (b)
     32 LOAD_CONST               2 (7)
     34 BINARY_ADD
     36 LOAD_FAST                2 (i)
     38 BINARY_SUBTRACT
     40 STORE_FAST               3 (b)

     42 LOAD_GLOBAL              2 (chr)
     44 LOAD_FAST                3 (b)
     46 CALL_FUNCTION            1
     48 STORE_FAST               4 (a)

     50 LOAD_FAST                1 (o)
     52 LOAD_FAST                4 (a)
     54 INPLACE_ADD
     56 STORE_FAST               1 (o)
     58 JUMP_ABSOLUTE           14
>>   60 POP_BLOCK

>>   62 LOAD_FAST                1 (o)
     64 RETURN_VALUE