dis module is pure python and appears to work, at least as far as my simple test goes

>>>>> 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

(I have PYTHONPATH=/usr/lib/python3.6/:/usr/lib/python3.6/site-packages, just my distro provided python 3.6 standard lib)

for comparison, though, here is the same function in CPython 3.6.8 (same dis module)

>>> 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

Add support for dis module #367

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