O parâmetro de consulta `q` é do tipo `str | None`, isso significa que é do tipo `str`, mas também pode ser `None`, e de fato, o valor padrão é `None`, então o FastAPI saberá que não é obrigatório.

/// note | Nota

O FastAPI saberá que o valor de `q` não é obrigatório por causa do valor padrão `= None`.

Ter `str | None` permitirá que seu editor lhe ofereça melhor suporte e detecte erros.

///

Le paramètre de requête `q` est de type `str | None`, cela signifie qu’il est de type `str` mais peut aussi être `None`, et en effet, la valeur par défaut est `None`, donc FastAPI saura qu’il n’est pas requis.

/// note | Remarque

FastAPI saura que la valeur de `q` n’est pas requise grâce à la valeur par défaut `= None`.

class MethodsDependency:
    def synchronous(self, value: str) -> str:
        return value

    async def asynchronous(self, value: str) -> str:
        return value

    def synchronous_gen(self, value: str) -> Generator[str, None, None]:
        yield value

    async def asynchronous_gen(self, value: str) -> AsyncGenerator[str, None]:
        yield value


callable_dependency = CallableDependency()

@pytest.mark.parametrize(
    "path",
    ["/optional-list-str", "/model-optional-list-str"],
)
def test_optional_list_str_missing(path: str):
    client = TestClient(app)
    response = client.post(path)
    assert response.status_code == 200, response.text
    assert response.json() == {"p": None}


@pytest.mark.parametrize(
    "path",
    ["/optional-list-str", "/model-optional-list-str"],
)
def test_optional_list_str(path: str):

}


class Token(BaseModel):
    access_token: str
    token_type: str


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

      assertFalse(str, c == Ascii.toUpperCase(c));
      assertTrue(str, Ascii.isLowerCase(c));
      assertFalse(str, Ascii.isUpperCase(c));
    }
  }

  public void testCharsUpper() {
    for (char c : UPPER.toCharArray()) {
      String str = String.valueOf(c);
      assertFalse(str, c == Ascii.toLowerCase(c));
      assertTrue(str, c == Ascii.toUpperCase(c));
      assertFalse(str, Ascii.isLowerCase(c));

      assertFalse(str, c == Ascii.toUpperCase(c));
      assertTrue(str, Ascii.isLowerCase(c));
      assertFalse(str, Ascii.isUpperCase(c));
    }
  }

  public void testCharsUpper() {
    for (char c : UPPER.toCharArray()) {
      String str = String.valueOf(c);
      assertFalse(str, c == Ascii.toLowerCase(c));
      assertTrue(str, c == Ascii.toUpperCase(c));
      assertFalse(str, Ascii.isLowerCase(c));

    }
}


class Token(BaseModel):
    access_token: str
    token_type: str


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()

        raise fastapi.exceptions.FastAPIError(
            _invalid_args_message.format(type_=type_)
        ) from None


def generate_operation_id_for_path(
    *, name: str, path: str, method: str
) -> str:  # pragma: nocover
    warnings.warn(
        message="fastapi.utils.generate_operation_id_for_path() was deprecated, "
        "it is not used internally, and will be removed soon",

        self,
        *,
        scheme: str,
        scheme_name: str | None = None,
        description: str | None = None,
        auto_error: bool = True,
    ):
        self.model = HTTPBaseModel(scheme=scheme, description=description)
        self.scheme_name = scheme_name or self.__class__.__name__
        self.auto_error = auto_error

    def make_authenticate_headers(self) -> dict[str, str]: