Dans le dernier sondage effectué auprès de développeurs python il était clair que <a href="https://www.jetbrains.com/research/python-developers-survey-2017/#tools-and-features" class="external-link" target="_blank">la fonctionnalité la plus utilisée est "l’autocomplétion"</a>.

Tout le framework **FastAPI** a été conçu avec cela en tête. L'autocomplétion fonctionne partout.

/// note | Technical Details

`FastAPI` is a class that inherits directly from `Starlette`.

You can use all the <a href="https://www.starlette.io/" class="external-link" target="_blank">Starlette</a> functionality with `FastAPI` too.

///

### Step 2: create a `FastAPI` "instance" { #step-2-create-a-fastapi-instance }

{* ../../docs_src/first_steps/tutorial001.py hl[3] *}

   *
   * @param value any {@code long} value
   * @return the same value cast to {@code char} if it is in the range of the {@code char} type,
   *     {@link Character#MAX_VALUE} if it is too large, or {@link Character#MIN_VALUE} if it is too
   *     small
   */
  public static char saturatedCast(long value) {
    if (value > Character.MAX_VALUE) {
      return Character.MAX_VALUE;
    }
    if (value < Character.MIN_VALUE) {

from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    price: float
    is_offer: Union[bool, None] = None


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):

O Python possui suporte para "dicas de tipo" ou "type hints" (também chamado de "anotações de tipo" ou "type annotations")

Esses **"type hints"** são uma sintaxe especial que permite declarar o <abbr title = "por exemplo: str, int, float, bool">tipo</abbr> de uma variável.

Ao declarar tipos para suas variáveis, editores e ferramentas podem oferecer um melhor suporte.

            "A duplicate name exists on the network.", "The network name cannot be found.", "ERRnomoreconn.", "The file exists.",
            "The parameter is incorrect.", "Too many Uids active on this session.",
            "The Uid is not known as a valid user identifier on this session.", "The pipe has been ended.",

            "A duplicate name exists on the network.", "The network name cannot be found.", "ERRnomoreconn.", "The file exists.",
            "The parameter is incorrect.", "Too many Uids active on this session.",
            "The Uid is not known as a valid user identifier on this session.", "The pipe has been ended.",

        bool((must, should, mustNot, filter) -> notLambda.callback(mustNot), opLambda);
    }

    public void bool(BoolCall<FileAuthenticationCQ> boolLambda) {
        bool(boolLambda, null);
    }

    public void bool(BoolCall<FileAuthenticationCQ> boolLambda, ConditionOptionCall<BoolQueryBuilder> opLambda) {

  }

  /**
   * Creates a TimeLimiter instance using the given executor service to execute method calls.
   *
   * <p><b>Warning:</b> using a bounded executor may be counterproductive! If the thread pool fills
   * up, any time callers spend waiting for a thread may count toward their time limit, and in this
   * case the call may even time out before the target method is ever invoked.
   *

Diese Funktionen existieren (statt die Klassen direkt zu verwenden), damit Ihr Editor keine Fehlermeldungen über ihre Typen ausgibt.

Auf diese Weise können Sie Ihren Editor und Ihre Programmier-Tools verwenden, ohne besondere Einstellungen vornehmen zu müssen, um diese Fehlermeldungen stummzuschalten.