>>> from dis import dis
>>> def a(x):
...     return x == "a" or x == "b" or x == 1
...
>>> dis(a)
  1           0 RESUME                   0

  2           2 LOAD_FAST                0 (x)
              4 LOAD_CONST               1 ('a')
              6 COMPARE_OP              40 (==)
             10 COPY                     1
             12 POP_JUMP_IF_TRUE        12 (to 38)
             14 POP_TOP
             16 LOAD_FAST                0 (x)
             18 LOAD_CONST               2 ('b')
             20 COMPARE_OP              40 (==)
             24 COPY                     1
             26 POP_JUMP_IF_TRUE         5 (to 38)
             28 POP_TOP
             30 LOAD_FAST                0 (x)
             32 LOAD_CONST               3 (1)
             34 COMPARE_OP              40 (==)
        >>   38 RETURN_VALUE
>>> def b(x):
...     return x in {"a", "b", 1}
...
>>> dis(b)
  1           0 RESUME                   0

  2           2 LOAD_FAST                0 (x)
              4 LOAD_CONST               1 (frozenset({1, 'b', 'a'}))
              6 CONTAINS_OP              0
              8 RETURN_VALUE