# Python Types Intro

Python has support for optional "type hints" (also called "type annotations").

These **"type hints"** or annotations are a special syntax that allow declaring the <abbr title="for example: str, int, float, bool">type</abbr> of a variable.

By declaring types for your variables, editors and tools can give you better support.

import okhttp3.internal.http2.Http2.TYPE_CONTINUATION
import okhttp3.internal.http2.Http2.TYPE_DATA
import okhttp3.internal.http2.Http2.TYPE_GOAWAY
import okhttp3.internal.http2.Http2.TYPE_HEADERS
import okhttp3.internal.http2.Http2.TYPE_PING
import okhttp3.internal.http2.Http2.TYPE_PUSH_PROMISE
import okhttp3.internal.http2.Http2.TYPE_RST_STREAM
import okhttp3.internal.http2.Http2.TYPE_SETTINGS

import okhttp3.internal.http2.Http2.TYPE_CONTINUATION
import okhttp3.internal.http2.Http2.TYPE_DATA
import okhttp3.internal.http2.Http2.TYPE_GOAWAY
import okhttp3.internal.http2.Http2.TYPE_HEADERS
import okhttp3.internal.http2.Http2.TYPE_PING
import okhttp3.internal.http2.Http2.TYPE_PRIORITY
import okhttp3.internal.http2.Http2.TYPE_PUSH_PROMISE
import okhttp3.internal.http2.Http2.TYPE_RST_STREAM

  @JvmName("reifiedTag")
  inline fun <reified T : Any> tag(): T? = tag(T::class)

  /** Returns the tag attached with [type] as a key, or null if no tag is attached with that key. */
  fun <T : Any> tag(type: KClass<T>): T? = type.java.cast(tags[type])

  /**
   * Returns the tag attached with `Object.class` as a key, or null if no tag is attached with
   * that key.
   *

    api.allTypes()
        .filter { type -> type.isPublic && apiSpec.isApi(type.sourceName) }
        .flatMap { type -> kotlinExtensionFunctionsFor(type, sinceSupplier) }
        .distinctBy(::signatureKey)


private
fun signatureKey(extension: KotlinExtensionFunction): List<Any> = extension.run {
    listOf(targetType.sourceName, name) +
        parameters.flatMap { apiTypeKey(it.type) }
}


private

* `status_code` - An `int` HTTP status code.
* `headers` - A `dict` of strings.
* `media_type` - A `str` giving the media type. E.g. `"text/html"`.

FastAPI (actually Starlette) will automatically include a Content-Length header. It will also include a Content-Type header, based on the media_type and appending a charset for text types.

```Python hl_lines="1  18"
{!../../../docs_src/response_directly/tutorial002.py!}
```

      private var type = MIXED
      private val parts = mutableListOf<Part>()

      /**
       * Set the MIME type. Expected values for `type` are [MIXED] (the default), [ALTERNATIVE],
       * [DIGEST], [PARALLEL] and [FORM].
       */
      fun setType(type: MediaType) =
        apply {
          require(type.type == "multipart") { "multipart != $type" }
          this.type = type
        }

      |Content-Type: multipart/mixed; boundary=BbC04y
      |
      |--BbC04y
      |Content-Disposition: file; filename="file1.txt"
      |Content-Type: text/plain; charset=utf-8
      |
      |... contents of file1.txt ...
      |--BbC04y
      |Content-Disposition: file; filename="file2.gif"
      |Content-Transfer-Encoding: binary
      |Content-Type: image/gif
      |

import org.jetbrains.kotlin.types.*
import org.jetbrains.kotlin.types.checker.NewCapturedType
import org.jetbrains.kotlin.types.checker.NewTypeVariableConstructor
import org.jetbrains.kotlin.types.checker.SimpleClassicTypeSystemContext.eraseContainingTypeParameters
import org.jetbrains.kotlin.types.error.ErrorType
import org.jetbrains.kotlin.types.error.ErrorTypeKind
import org.jetbrains.kotlin.types.error.ErrorUtils

# Introduction aux Types Python

Python supporte des annotations de type (ou *type hints*) optionnelles.

Ces annotations de type constituent une syntaxe spéciale qui permet de déclarer le <abbr title="par exemple : str, int, float, bool">type</abbr> d'une variable.

En déclarant les types de vos variables, cela permet aux différents outils comme les éditeurs de texte d'offrir un meilleur support.