Прочти код внимательно

from dataclasses import dataclass, field


@dataclass(kw_only=True, slots=True)
class User:
    id: int
    name: str
    email: str


u = User(id=42, name="Ada", email="ada@x.com")
print(u)
print(hasattr(u, "__dict__"))

try:
    User(42, "Ada", "ada@x.com")
except TypeError as e:
    print("positional rejected" if "positional" in str(e).lower() else "rejected")

try:
    u.extra = "no"
except AttributeError:
    print("attrs locked")


@dataclass
class Mix:
    a: int
    b: int = field(kw_only=True)
    c: int = 0


m = Mix(1, c=3, b=2)
print(m)

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