bytes code add_42 python 3.12

byte_code.py

import types
import dis
import inspect

bin_op: dict[str,int] = {v[1]: i for i, v in enumerate(dis._nb_ops)}

def op(code_name: str, arg: int = 0) -> (int, int):
    return dis.opmap[code_name], arg

code_ints = [
    *op("RESUME"),
    *op("LOAD_FAST", arg=0),
    *op("LOAD_CONST", arg=1),
    *op("BINARY_OP", arg=bin_op['+']),
    *op("CACHE"),
    *op("RETURN_VALUE"),
    ]

code_manual = types.CodeType(
    1, # n
    0,
    0,
    1, # n
    2, # n,42
    inspect.CO_OPTIMIZED | inspect.CO_NEWLOCALS,
    bytes(code_ints),
    (None, 42),
    tuple(),
    ('n',),
    '<manual>',
    'manual_gen_add_42',
    'manual_gen_add_42',
    1,
    bytes(),
    bytes(),
    tuple(),
    tuple(),
)

func = types.FunctionType(code_manual, globals(), "manual_gen_add_42")
print(func(5))
dis.dis(func, show_caches=True)

def add_42(v):
    return v + 42

print(add_42(5))
dis.dis(add_42, show_caches=True)

output.log

47
          0 RESUME                   0
          2 LOAD_FAST                0 (n)
          4 LOAD_CONST               1 (42)
          6 BINARY_OP                0 (+)
          8 CACHE                    0 (counter: 0)
         10 RETURN_VALUE
47
 44           0 RESUME                   0

 45           2 LOAD_FAST                0 (v)
              4 LOAD_CONST               1 (42)
              6 BINARY_OP                0 (+)
              8 CACHE                    0 (counter: 0)
             10 RETURN_VALUE