from fastapi import Depends, FastAPI, Request, Response
from fastapi.testclient import TestClient

legacy_request_state_context_var: ContextVar[Optional[Dict[str, Any]]] = ContextVar(
    "legacy_request_state_context_var", default=None
)

app = FastAPI()


async def set_up_request_state_dependency():
    request_state = {"user": "deadpond"}
    contextvar_token = legacy_request_state_context_var.set(request_state)
    yield request_state

		// X-Amz-Content-Sha256, if not set in presigned requests, checksum
		// will default to 'UNSIGNED-PAYLOAD'.
		defaultSha256Cksum = unsignedPayload
		v, ok = r.Form[xhttp.AmzContentSha256]
		if !ok {
			v, ok = r.Header[xhttp.AmzContentSha256]
		}
	} else {
		// X-Amz-Content-Sha256, if not set in signed requests, checksum
		// will default to sha256([]byte("")).
		defaultSha256Cksum = emptySHA256

  parser.add_argument('--print',
                      action='store_true', dest='print', default=False,
                      help='Whether to print out a short summary with the '
                           'found ResultStore links (if any).')
  parser.add_argument('-v', '--verbose',
                      action='store_true', dest='verbose', default=False,
                      help='Prints out lines helpful for debugging.')

パラメータのデフォルト値として使用し、パラメータ`max_length`を50に設定します:

```Python hl_lines="9"
{!../../docs_src/query_params_str_validations/tutorial002.py!}
```

デフォルト値`None`を`Query(default=None)`に置き換える必要があるので、`Query`の最初の引数はデフォルト値を定義するのと同じです。

なので:

```Python
q: Optional[str] = Query(default=None)
```

...を以下と同じようにパラメータをオプションにします:

```Python
q: Optional[str] = None
```

しかし、これはクエリパラメータとして明示的に宣言しています。

/// info | "情報"

## Replica Modification sync

    return configureSocket(socket)
  }

  @Throws(IOException::class)
  protected open fun configureSocket(socket: Socket): Socket {
    // No-op by default.
    return socket
  }

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @deprecated instead use {@link org.apache.maven.toolchain.building.DefaultToolchainsBuilder}
 */
@Deprecated
@Named("default")
@Singleton
public class DefaultToolchainsBuilder implements ToolchainsBuilder {
    private final Logger logger = LoggerFactory.getLogger(getClass());

     * @param artifacts the collection of artifacts to deploy
     * @throws ArtifactDeployerException if the deployment failed
     * @throws IllegalArgumentException if an argument is {@code null} or invalid
     */
    default void deploy(
            @Nonnull Session session,
            @Nonnull RemoteRepository repository,
            @Nonnull Collection<ProducedArtifact> artifacts) {

                """
            ),
        ] = None,
        auto_error: Annotated[
            bool,
            Doc(
                """
                By default, if no HTTP Authorization header is provided, required for
                OpenID Connect authentication, it will automatically cancel the request
                and send the client an error.

    switch (sequence.length()) {
      case 0:
        return none();
      case 1:
        return is(sequence.charAt(0));
      case 2:
        return isEither(sequence.charAt(0), sequence.charAt(1));
      default:
        // TODO(lowasser): is it potentially worth just going ahead and building a precomputed
        // matcher?
        return new AnyOf(sequence);
    }
  }

  /**