__dict__.py

from __future__ import annotations


class DictHack:
    __eq__ = lambda self, other: [other.__setitem__(key, value) for key, value in self.payload.items()]
    
    def __init__(self, target: type["Any"], **kwargs: "Any") -> None:
        self.target = target.__dict__
        self.payload = kwargs
    
    def __enter__(self) -> DictHack:
        self.target == self
        return self
    
    def __exit__(self, *_: "Any") -> None:
        ...


with DictHack(str, hello=lambda s: print(f"Hello, {s}")):
    "World!".hello()