cursed-snakes/namespace-inject.py

from types import FunctionType
from typing import Callable


def func1(pstr: str) -> None:
    def foo() -> None:
        print(f"{pstr = }")

    foo()


def shoehorn(f: Callable) -> Callable:
    code = f.__code__.replace(
        co_nlocals=2,
        co_varnames=("pstr", "foo"),
    )

    return FunctionType(
        name=f.__name__,
        code=code,
        globals=func1.__globals__,
    )


@shoehorn
def func2(pstr: str) -> None:
    foo()


def func_info(f: Callable) -> None:
    print(f"{f.__name__ } = {f}, {f.__code__.co_varnames = }")
    f("bar")
    f("baz")


if __name__ == "__main__":
    func_info(func1)
    func_info(func2)

    import json

    print(json.dumps({
        name: repr(getattr(func2.__code__, name))
        for name in dir(func2.__code__)
    }, indent=2))