return this.nextCommand;
    }

    /**
     * Sets the read size for this message.
     *
     * @param readSize
     *            the readSize to set
     */
    public void setReadSize(final int readSize) {
        this.readSize = readSize;
    }

    /**
     * Checks whether this message is an asynchronous message.
     *
     * @return the async
     */

        }

        int r, n;
        final SmbComReadAndXResponse response = new SmbComReadAndXResponse(b, off);
        do {
            r = len > readSize ? readSize : len;
            file.send(new SmbComReadAndX(file.fid, fp, r, null), response);
            n = response.dataLength;
            if (n <= 0) {
                return (int) (fp - start > 0L ? fp - start : -1);

            }

            try (SmbFileHandle h = ensureOpen()) {}
            this.readSize = th.getReceiveBufferSize() - 70;
            this.writeSize = th.getSendBufferSize() - 70;

            if (th.hasCapability(SmbConstants.CAP_LARGE_READX)) {
                this.largeReadX = true;
                this.readSize =

     */
    private void init(final SmbTreeHandleInternal th) throws CIFSException {
        if (this.smb2) {
            this.readSize = th.getReceiveBufferSize();
            this.readSizeFile = th.getReceiveBufferSize();
            return;
        }

        this.readSize = Math.min(th.getReceiveBufferSize() - 70, th.getMaximumBufferSize() - 70);

        if (th.hasCapability(SmbConstants.CAP_LARGE_READX)) {

        if (file.type == SmbFile.TYPE_NAMED_PIPE) {
            response.responseTimeout = 0;
        }

        int r, n;
        do {
            r = len > readSize ? readSize : len;

            if (LogStream.level >= 4) {
                SmbFile.log.println("read: len=" + len + ",r=" + r + ",fp=" + fp);
            }

            try {

	// Alignment not required.
	currentPaths sync.Map

	cycleInfoMu sync.Mutex
	cycleInfo   *currentScannerCycle
}

var globalScannerMetrics scannerMetrics

const (
	// START Realtime metrics, that only to records
	// last minute latencies and total operation count.
	scannerMetricReadMetadata scannerMetric = iota
	scannerMetricCheckMissing
	scannerMetricSaveUsage
	scannerMetricApplyAll

So, in our example, we can make `tags` be specifically a "list of strings":

{* ../../docs_src/body_nested_models/tutorial002_py310.py hl[12] *}

## Set types { #set-types }

But then we think about it, and realize that tags shouldn't repeat, they would probably be unique strings.

And Python has a special data type for sets of unique items, the `set`.

Then we can declare `tags` as a set of strings:

Y como la mayor parte del tiempo de ejecución se dedica al trabajo real (en lugar de esperar), y el trabajo en una computadora lo realiza una <abbr title="Central Processing Unit">CPU</abbr>, llaman a estos problemas "CPU bound".

---

Ejemplos comunes de operaciones limitadas por la CPU son cosas que requieren procesamiento matemático complejo.

```Python hl_lines="3  5-6"
{
    "name": "Baz",
    "description": None,
    "price": 50.2,
    "tax": 10.5,
    "tags": []
}
```

FastAPI is smart enough (actually, Pydantic is smart enough) to realize that, even though `description`, `tax`, and `tags` have the same values as the defaults, they were set explicitly (instead of taken from the defaults).

So, they will be included in the JSON response.

/// tip

De la misma manera, hay muchas herramientas compatibles. Incluyendo herramientas de generación de código para muchos lenguajes.

## Pydantic

Toda la validación de datos se realiza internamente con <a href="https://docs.pydantic.dev/" class="external-link" target="_blank">Pydantic</a>, así que obtienes todos los beneficios de esta. Y sabes que estás en buenas manos.