```console
$ pip install "fastapi[all]"
---> 100%
```

</div>

### 建立 `Settings` 物件 { #create-the-settings-object }

從 Pydantic 匯入 `BaseSettings` 並建立子類別，與建立 Pydantic model 的方式非常類似。

就像使用 Pydantic model 一樣，你用型別註解宣告類別屬性，並可選擇性地提供預設值。

你可以使用與 Pydantic model 相同的所有驗證功能與工具，例如不同的資料型別與透過 `Field()` 進行額外驗證。

{* ../../docs_src/settings/tutorial001_py310.py hl[2,5:8,11] *}

/// tip

如果你想要可以直接複製貼上的範例，先別用這個，請改用本文最後一個範例。

///

from datetime import date

from pydantic import BaseModel

# Déclarez une variable comme étant une str
# et profitez de l'aide de l'éditeur dans cette fonction
def main(user_id: str):
    return user_id


# Un modèle Pydantic
class User(BaseModel):
    id: int
    name: str
    joined: date
```

Qui peuvent ensuite être utilisés comme ceci :

```Python
my_user: User = User(id=3, name="John Doe", joined="2018-07-19")

}

func BenchmarkMutexWorkSlack(b *testing.B) {
	benchmarkMutex(b, true, true)
}

func BenchmarkMutexNoSpin(b *testing.B) {
	b.ResetTimer()
	b.ReportAllocs()

	// This benchmark models a situation where spinning in the mutex should be
	// non-profitable and allows to confirm that spinning does not do harm.
	// To achieve this we create excess of goroutines most of which do local work.

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.model.interpolation;

import java.util.Date;
import java.util.Properties;

import org.codehaus.plexus.interpolation.AbstractValueSource;

/**
 * @deprecated use {@code org.apache.maven.api.services.ModelBuilder} instead

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.model.interpolation;

import java.util.Date;
import java.util.Properties;

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertTrue;

@Deprecated

La réponse ressemblerait à ceci :

```JSON
{
    "X-Token values": [
        "bar",
        "foo"
    ]
}
```

## Récapitulatif { #recap }

Déclarez les en-têtes avec `Header`, en suivant le même modèle que pour `Query`, `Path` et `Cookie`.

                          Apache Maven

  What is it?
  -----------

  Maven is a software project management and comprehension tool. Based on
  the concept of a Project Object Model (POM), Maven can manage a project's
  build, reporting and documentation from a central piece of information.

  Documentation
  -------------

  The most up-to-date documentation can be found at https://maven.apache.org/.

  Release Notes
  -------------

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.profiles.activation;

import org.apache.maven.model.Profile;

/**
 * DetectedProfileActivator
 */
@Deprecated
public abstract class DetectedProfileActivator implements ProfileActivator {
    @Override
    public boolean canDetermineActivation(Profile profile) {

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.model.building;

/**
 * Assists in firing events from a generic method by abstracting from the actual callback method to be called on the
 * listener.
 *

     * @param settingsFile The settings file, must not be {@code null}.
     */
    public FileSettingsSource(File settingsFile) {
        super(settingsFile);
    }

    /**
     * Gets the settings file of this model source.
     *
     * @return The underlying settings file, never {@code null}.
     * @deprecated instead use {@link #getFile()}
     */
    @Deprecated
    public File getSettingsFile() {
        return getFile();