([#123273](https://github.com/kubernetes/kubernetes/pull/123273),...

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 *
 * <p>"IPv4 mapped" addresses were originally a representation of IPv4 addresses for use on an IPv6
 * socket that could receive both IPv4 and IPv6 connections (by disabling the {@code IPV6_V6ONLY}
 * socket option on an IPv6 socket). Yes, it's confusing. Nevertheless, these "mapped" addresses
 * were never supposed to be seen on the wire. That assumption was dropped, some say mistakenly, in

Por ejemplo, <a href="https://docs.python.org/3/tutorial/inputoutput.html#reading-and-writing-files" class="external-link" target="_blank">puedes usar `with` para leer un archivo</a>:

```Python
with open("./somefile.txt") as f:
    contents = f.read()
    print(contents)
```

Internamente, `open("./somefile.txt")` crea un objeto llamado "Context Manager".

	tierRequestsSuccessMD = MetricDescription{
		Namespace: nodeMetricNamespace,
		Subsystem: tierSubsystem,
		Name:      tierRequestsSuccess,
		Help:      "Number of requests to download object from warm tier that were successful",
		Type:      counterMetric,
	}
	// {minio_node}_{tier}_{requests_failure}
	tierRequestsFailureMD = MetricDescription{
		Namespace: nodeMetricNamespace,
		Subsystem: tierSubsystem,

    private static final Logger log = LoggerFactory.getLogger(NetworkExplorer.class);

    /** The CSS style for HTML rendering */
    private String style;
    /** Flag indicating if credentials were supplied */
    private boolean credentialsSupplied;
    /** Flag to enable basic authentication */
    private boolean enableBasic;
    /** Flag to allow insecure basic authentication */
    private boolean insecureBasic;

 * <i>type</i> offering meaningful behavioral guarantees. This is substantially different from the
 * case of (say) {@link HashSet}, which is an <i>implementation</i>, with semantics that were
 * largely defined by its supertype.
 *
 * <p>For field types and method return types, you should generally use the immutable type (such as

Vemos que vamos a necesitar algunas dependencias usadas en varios lugares de la aplicación.

Así que las ponemos en su propio módulo `dependencies` (`app/dependencies.py`).

Ahora utilizaremos una dependencia simple para leer un encabezado `X-Token` personalizado:

//// tab | Python 3.9+

```Python hl_lines="3  6-8" title="app/dependencies.py"
{!> ../../docs_src/bigger_applications/app_an_py39/dependencies.py!}
```

////

    private MimeMap mimeMap;
    /** The CSS style for HTML rendering */
    private String style;
    /** The NTLM SSP handler */
    private NtlmSsp ntlmSsp;
    /** Flag indicating if credentials were supplied */
    private boolean credentialsSupplied;
    /** Flag to enable basic authentication */
    private boolean enableBasic;
    /** Flag to allow insecure basic authentication */
    private boolean insecureBasic;

- Modified command line errors (for example, `kubectl list` -> `unknown command`) that were printed as log message with escaped line breaks instead of a multi-line plain text, making the error hard to read. ([#107044](https://github.com/kubernetes/kubernetes/pull/107044), [@pohly](https://github.com/pohly))