// to explicitly say that the ContentLength is zero is
		// to set the Body to nil. But turns out too much code
		// depends on NewRequest returning a non-nil Body,
		// so we use a well-known ReadCloser variable instead
		// and have the http package also treat that sentinel
		// variable to mean explicitly zero.
		if req.GetBody != nil && req.ContentLength == 0 {
			req.Body = http.NoBody

That when called, return instances of classes of the same name.

So, you import `Query`, which is a function. And when you call it, it returns an instance of a class also named `Query`.

These functions are there (instead of just using the classes directly) so that your editor doesn't mark errors about their types.

That way you can use your normal editor and coding tools without having to add custom configurations to disregard those errors.

Translate to Spanish (español).

Use the informal grammar (use "tú" instead of "usted").

For instructions or titles in imperative, keep them in imperative, for example "Edit it" to "Edítalo".

---

For the next terms, use the following translations:

* framework: framework (do not translate to "marco")
* performance: rendimiento
* program (verb): programar
* code (verb): programar
* type hints: anotaciones de tipos

<img src="/img/tutorial/body/image02.png">

## Editor support { #editor-support }

In your editor, inside your function you will get type hints and completion everywhere (this wouldn't happen if you received a `dict` instead of a Pydantic model):

<img src="/img/tutorial/body/image03.png">

You also get error checks for incorrect type operations:

<img src="/img/tutorial/body/image04.png">

			// funktionieren", tested against a real AWS S3 bucket, S3 may encode incorrectly. For
			// example, "ö" was encoded as =?UTF-8?B?w4PCtg==?=, producing invalid UTF-8 instead
			// of =?UTF-8?B?w7Y=?=. This mirrors errors like the ä½ in another string.
			//
			// S3 uses B-encoding (Base64) for non-ASCII-heavy metadata and Q-encoding

}

// TryLockedOpenFile - tries a new write lock, functionality
// it is similar to LockedOpenFile with with syscall.LOCK_EX
// mode but along with syscall.LOCK_NB such that the function
// doesn't wait forever but instead returns if it cannot
// acquire a write lock.
func TryLockedOpenFile(path string, flag int, perm os.FileMode) (*LockedFile, error) {
	var lockType uint32 = lockFileFailImmediately | lockFileExclusiveLock

        on_startup: Annotated[
            Optional[Sequence[Callable[[], Any]]],
            Doc(
                """
                A list of startup event handler functions.

                You should instead use the `lifespan` handlers.

                Read more in the [FastAPI docs for `lifespan`](https://fastapi.tiangolo.com/advanced/events/).
                """
            ),
        ] = None,

			// operations for now to begin with.
			if concurrency < 4 {
				concurrency = 4
			}

			// if GOMAXPROCS is set to a lower value then choose to use
			// concurrency == GOMAXPROCS instead.
			if runtime.GOMAXPROCS(0) < concurrency {
				concurrency = runtime.GOMAXPROCS(0)
			}
		}

		throughputHighestGet := uint64(0)
		throughputHighestPut := uint64(0)

// algorithms compute correct checksums. If any algorithm
// produces an incorrect checksum it fails with a hard error.
//
// bitrotSelfTest tries to catch any issue in the bitrot implementation
// early instead of silently corrupting data.
func bitrotSelfTest() {
	checksums := map[BitrotAlgorithm]string{
		SHA256:          "a7677ff19e0182e4d52e3a3db727804abc82a5818749336369552e54b838b004",

 * </ul>
 * Plugin versions are upgraded in both {@code <build><plugins>} and {@code <build><pluginManagement><plugins>} sections.
 * If a plugin version is defined via a property, the property value is updated instead.
 *
 * <h3>Inference Optimizations (Optional)</h3>
 * When {@code --infer} option is enabled, applies inference optimizations to remove redundant information:
 *
 * <h4>Limited Inference for 4.0.0 Models (Maven 3.x POMs)</h4>