>>>>> def fib(a):
.....     return a if a < 2 else fib(a-1) + fib(a-2)
>>>>> for i in range(10):
.....    print(fib(i))
0
1
1
2
3
5
8
13
21
34
>>>>> dis.dis(fib)
                 0 LoadName             (a)
                 1 LoadConst            (2)
                 2 CompareOperation     (Less)
                 3 Duplicate
                 4 JumpIfFalse          (8)
                 5 Pop
                 6 LoadName             (a)
                 7 Jump                 (19)
          >>     8 LoadName             (fib)
                 9 LoadName             (a)
                10 LoadConst            (1)
                11 BinaryOperation      (Subtract, false)
                12 CallFunction         (Positional(1))
                13 LoadName             (fib)
                14 LoadName             (a)
                15 LoadConst            (2)
                16 BinaryOperation      (Subtract, false)
                17 CallFunction         (Positional(1))
                18 BinaryOperation      (Add, false)
          >>    19 ReturnValue
                20 LoadConst            (None)
                21 ReturnValue

>>> dis.dis(fib)
  2           0 LOAD_FAST                0 (a)
              2 LOAD_CONST               1 (2)
              4 COMPARE_OP               0 (<)
              6 POP_JUMP_IF_FALSE       12
              8 LOAD_FAST                0 (a)
             10 RETURN_VALUE
        >>   12 LOAD_GLOBAL              0 (fib)
             14 LOAD_FAST                0 (a)
             16 LOAD_CONST               2 (1)
             18 BINARY_SUBTRACT
             20 CALL_FUNCTION            1
             22 LOAD_GLOBAL              0 (fib)
             24 LOAD_FAST                0 (a)
             26 LOAD_CONST               1 (2)
             28 BINARY_SUBTRACT
             30 CALL_FUNCTION            1
             32 BINARY_ADD
             34 RETURN_VALUE