以下代码使用了dataclasses的__post_init

from dataclasses import dataclass, field, InitVar

@dataclass
class User:
    name: str
    password: InitVar[str]
    hashed: str = field(init=False)

    def __post_init__(self, password: str):
        self.hashed = f"hash({password})"

u = User("alice", "secret123")
print(f"{u.name} {u.hashed}, {hasattr(u, 'password')}")