```Python
UserInDB(**user_dict)
```

would result in something equivalent to:

```Python
UserInDB(
    username="john",
    password="secret",
    email="******@****.***",
    full_name=None,
)
```

Or more exactly, using `user_dict` directly, with whatever contents it might have in the future:

```Python
UserInDB(
    username = user_dict["username"],

因此，延續上面的 `user_dict`，寫成：

```Python
UserInDB(**user_dict)
```

效果等同於：

```Python
UserInDB(
    username="john",
    password="secret",
    email="******@****.***",
    full_name=None,
)
```

更精確地說，直接使用 `user_dict`（未來內容可能有所不同）則等同於：

```Python
UserInDB(
    username = user_dict["username"],
    password = user_dict["password"],

class TokenData(BaseModel):
    username: str | None = None


class User(BaseModel):
    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


class UserInDB(User):
    hashed_password: str


password_hash = PasswordHash.recommended()

DUMMY_HASH = password_hash.hash("dummypassword")

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

app = FastAPI()

    scopes: list[str] = []


class User(BaseModel):
    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


class UserInDB(User):
    hashed_password: str


password_hash = PasswordHash.recommended()

DUMMY_HASH = password_hash.hash("dummypassword")

oauth2_scheme = OAuth2PasswordBearer(
    tokenUrl="token",

    scopes: list[str] = []


class User(BaseModel):
    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


class UserInDB(User):
    hashed_password: str


password_hash = PasswordHash.recommended()

DUMMY_HASH = password_hash.hash("dummypassword")

oauth2_scheme = OAuth2PasswordBearer(
    tokenUrl="token",

class TokenData(BaseModel):
    username: str | None = None


class User(BaseModel):
    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


class UserInDB(User):
    hashed_password: str


password_hash = PasswordHash.recommended()

DUMMY_HASH = password_hash.hash("dummypassword")

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

app = FastAPI()

{* ../../docs_src/security/tutorial003_an_py310.py hl[82:85] *}

#### About `**user_dict` { #about-user-dict }

`UserInDB(**user_dict)` means:

*Pass the keys and values of the `user_dict` directly as key-value arguments, equivalent to:*

```Python
UserInDB(
    username = user_dict["username"],
    email = user_dict["email"],
    full_name = user_dict["full_name"],

因此攻擊者無法嘗試把那些密碼用在其他系統上（因為很多使用者在各處都用同一組密碼，這會很危險）。

{* ../../docs_src/security/tutorial003_an_py310.py hl[82:85] *}

#### 關於 `**user_dict**` { #about-user-dict }

`UserInDB(**user_dict)` 的意思是：

把 `user_dict` 的鍵和值直接當作具名參數傳入，等同於：

```Python
UserInDB(
    username = user_dict["username"],
    email = user_dict["email"],
    full_name = user_dict["full_name"],
    disabled = user_dict["disabled"],

这样一来，窃贼就无法在其它应用中使用窃取的密码，要知道，很多用户在所有系统中都使用相同的密码，风险超大。

{* ../../docs_src/security/tutorial003_an_py310.py hl[82:85] *}

#### 关于 `**user_dict` { #about-user-dict }

`UserInDB(**user_dict)` 是指：

*直接把 `user_dict` 的键与值当作关键字参数传递，等效于：*

```Python
UserInDB(
    username = user_dict["username"],
    email = user_dict["email"],
    full_name = user_dict["full_name"],
    disabled = user_dict["disabled"],

{* ../../docs_src/security/tutorial003_an_py310.py hl[82:85] *}

#### `**user_dict` について { #about-user-dict }

`UserInDB(**user_dict)` は次を意味します:

`user_dict` のキーと値を、そのままキーワード引数として渡します。つまり次と同等です:

```Python
UserInDB(
    username = user_dict["username"],
    email = user_dict["email"],
    full_name = user_dict["full_name"],
    disabled = user_dict["disabled"],