---

"*Se você está procurando aprender um **_framework_ moderno** para construir aplicações _REST_, dê uma olhada no **FastAPI** [...] É rápido, fácil de usar e fácil de aprender [...]*"

"*Nós trocamos nossas **APIs** por **FastAPI** [...] Acredito que vocês gostarão dele [...]*"

  - type: textarea
    attributes:
      label: API(s)
      description: Which existing classes or methods do you want to improve?
      placeholder: e.g., `com.google.common.collect.ImmutableList::of`
      render: java
    validations:
      required: true

  - type: textarea
    attributes:
      label: How do you want it to be improved?
    validations:
      required: true

  - type: textarea
    attributes:

# Templating - `Jinja2Templates`

You can use the `Jinja2Templates` class to render Jinja templates.

Read more about it in the [FastAPI docs for Templates](https://fastapi.tiangolo.com/advanced/templates/).

You can import it directly from `fastapi.templating`:

```python
from fastapi.templating import Jinja2Templates
```

```Python hl_lines="20"
{!../../../docs_src/body_nested_models/tutorial004.py!}
```

Isso significa que o **FastAPI** vai esperar um corpo similar à:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2,
    "tags": ["rock", "metal", "bar"],
    "image": {
        "url": "http://example.com/baz.jpg",
        "name": "The Foo live"
    }
}
```

        get() = analysisContext.token
}

internal fun KotlinType.asStringForDebugging(analysisContext: Fe10AnalysisContext): String {
    val renderer = KtFe10DebugTypeRenderer()
    return prettyPrint { renderer.render(analysisContext, this@asStringForDebugging, this@prettyPrint) }

```Python hl_lines="20"
{!../../../docs_src/body_nested_models/tutorial004.py!}
```

이는 **FastAPI**가 다음과 유사한 본문을 기대한다는 것을 의미합니다:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2,
    "tags": ["rock", "metal", "bar"],
    "image": {
        "url": "http://example.com/baz.jpg",
        "name": "The Foo live"
    }
}
```

            task.outputOptions(options -> options.setBackends(singletonList("html5")));
            // TODO: This breaks the provider
            task.setOutputDir(extension.getUserManual().getStagingRoot().dir("render-single-html").get().getAsFile());
        });

        TaskProvider<AsciidoctorTask> userguideSinglePagePdf = tasks.register("userguideSinglePagePdf", AsciidoctorTask.class, task -> {

import org.jetbrains.kotlin.utils.SmartPrinter
import org.jetbrains.kotlin.utils.withIndent

object KtDiagnosticClassImplementationRenderer : AbstractDiagnosticsDataClassRenderer() {
    override fun SmartPrinter.render(diagnosticList: HLDiagnosticList, packageName: String) {
        printHeader(packageName, diagnosticList)
        printDiagnosticClassesImplementation(diagnosticList)
    }

Todo **FastAPI** está basado en estos type hints, lo que le da muchas ventajas y beneficios.

Pero, así nunca uses **FastAPI** te beneficiarás de aprender un poco sobre los type hints.

!!! note "Nota"
    Si eres un experto en Python y ya lo sabes todo sobre los type hints, salta al siguiente capítulo.

## Motivación

Comencemos con un ejemplo simple:

        get() = withValidityAssertion {
            val diagnostic = firDiagnostic as KtDiagnostic

            val firDiagnosticRenderer = RootDiagnosticRendererFactory(diagnostic)
            return firDiagnosticRenderer.render(diagnostic)
        }

    override val textRanges: Collection<TextRange>
        get() = withValidityAssertion { firDiagnostic.textRanges }

    @Suppress("UNCHECKED_CAST")
    override val psi: PSI