**FastAPI** is all based on these type hints, they give it many advantages and benefits.

But even if you never use **FastAPI**, you would benefit from learning a bit about them.

/// note

If you are a Python expert, and you already know everything about type hints, skip to the next chapter.

///

## Motivation { #motivation }

Let's start with a simple example:

{* ../../docs_src/python_types/tutorial001_py310.py *}

plugins {
  kotlin("jvm")
  id("okhttp.publish-conventions")
  id("okhttp.jvm-conventions")
  id("okhttp.quality-conventions")
  id("okhttp.testing-conventions")
}

project.applyOsgi(
  "Export-Package: okhttp3.sse",
  "Bundle-SymbolicName: com.squareup.okhttp3.sse",
)

project.applyJavaModules("okhttp3.sse")

dependencies {
  api(projects.okhttp)

  testImplementation(projects.okhttpTestingSupport)

        BwcVersions vc = new BwcVersions(
            listOfVersions.stream().map(this::formatVersionToLine).collect(Collectors.toList()),
            Version.fromString("8.0.0")
        );
        expectedEx.expect(IllegalStateException.class);
        expectedEx.expectMessage("but they are released");
        vc.compareToAuthoritative(authoritativeReleasedVersions);
    }

	m := Map(maxRune, []byte(a))
	expect := tenRunes(unicode.MaxRune)
	if string(m) != expect {
		t.Errorf("growing: expected %q got %q", expect, m)
	}

	// 2. Shrink
	minRune := func(r rune) rune { return 'a' }
	m = Map(minRune, []byte(tenRunes(unicode.MaxRune)))
	expect = a
	if string(m) != expect {
		t.Errorf("shrinking: expected %q got %q", expect, m)
	}

	// 3. Rot13

{* ../../docs_src/json_base64_bytes/tutorial001_py310.py ln[1:9,29:35] hl[9] *}

If you check the `/docs`, they will show that the field `data` expects base64 encoded bytes:

<div class="screenshot">
<img src="/img/tutorial/json-base64-bytes/image01.png">
</div>

You could send a request like:

```json
{
    "description": "Some data",

### Motivation

**PLEASE READ: This feature is meant for advanced use-cases only where the setup is using bucket versioning or with replicated buckets, use this feature to optimize versioning behavior for some specific applications. MinIO experts will evaluate and guide on the benefits for your application, please reach out to us on <https://subnet.min.io>.**

        assertThat(map.get("aaa"), is((Object) 1));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testGet_NotContains() throws Exception {
        exception.expect(IllegalKeyOfBeanMapException.class);
        exception.expectMessage(is("[ECL0016]key[xxx] is not included in this BeanMap : {aaa=1, bbb=2}."));
        final BeanMap map = new BeanMap();
        map.put("aaa", 1);

And you can declare some of the files as `bytes` and some as `UploadFile`.

/// warning

You can declare multiple `File` and `Form` parameters in a *path operation*, but you can't also declare `Body` fields that you expect to receive as JSON, as the request will have the body encoded using `multipart/form-data` instead of `application/json`.

This is not a limitation of **FastAPI**, it's part of the HTTP protocol.

///

## Recap { #recap }

.Values.minioConsolePort }} {{- template `minio.extraArgs` . }}" ] volumeMounts: {{- if $penabled }} {{- if (gt $drivesPerNode 1) }} {{- range $i := until $drivesPerNode }} - name: export-{{ $i }} mountPath: {{ $mountPath }}-{{ $i }} {{- if and $penabled $subPath }} subPath: {{ $subPath }} {{- end }} {{- end }} {{- else }} - name: export mountPath: {{ $mountPath }} {{- if and $penabled $subPath }} subPath: {{ $subPath }} {{- end }} {{- end }} {{- end }} {{- if .Values.extraSecret }} - name: extra-secret mountPath:...

.Values.minioConsolePort }} {{- template `minio.extraArgs` . }}" ] volumeMounts: {{- if $penabled }} {{- if (gt $drivesPerNode 1) }} {{- range $i := until $drivesPerNode }} - name: export-{{ $i }} mountPath: {{ $mountPath }}-{{ $i }} {{- if and $penabled $subPath }} subPath: {{ $subPath }} {{- end }} {{- end }} {{- else }} - name: export mountPath: {{ $mountPath }} {{- if and $penabled $subPath }} subPath: {{ $subPath }} {{- end }} {{- end }} {{- end }} {{- if .Values.extraSecret }} - name: extra-secret mountPath:...