from pydantic import BaseModel

app = FastAPI()


class Cookies(BaseModel):
    session_id: str
    fatebook_tracker: str | None = None
    googall_tracker: str | None = None


@app.get("/items/")
async def read_items(cookies: Annotated[Cookies, Cookie()]):

from typing import Annotated, Union

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(q: Annotated[Union[str, None], Query(min_length=3)] = ...):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})

from typing import Union

from fastapi import FastAPI, Query
from typing_extensions import Annotated

app = FastAPI()


@app.get("/items/")
async def read_items(
    hidden_query: Annotated[Union[str, None], Query(include_in_schema=False)] = None,
):
    if hidden_query:
        return {"hidden_query": hidden_query}
    else:

from fastapi import FastAPI
from fastapi.responses import StreamingResponse

app = FastAPI()


async def fake_video_streamer():
    for i in range(10):
        yield b"some fake video bytes"


@app.get("/")
async def main():

## More motivation

Check this function, it already has type hints:

{* ../../docs_src/python_types/tutorial003.py hl[1] *}

Because the editor knows the types of the variables, you don't only get completion, you also get error checks:

<img src="/img/python-types/image04.png">

Now you know that you have to fix it, convert `age` to a string with `str(age)`:

{* ../../docs_src/python_types/tutorial004.py hl[2] *}

          }

          for (int i = MIN_BOUND; i <= MAX_BOUND; i++) {
            assertEquals(expected.get(i), subRangeMap.get(i));
          }

          for (Range<Integer> query : RANGES) {
            assertEquals(
                expected.asMapOfRanges().get(query), subRangeMap.asMapOfRanges().get(query));
          }
        }
      }
    }
  }

  public void testSubSubRangeMap() {

        if (crawlerClientFactory != null) {
            return crawlerClientFactory;
        }
        final CrawlerClientFactory factory = creator.get();

        final FileAuthenticationService fileAuthenticationService = ComponentUtil.getComponent(FileAuthenticationService.class);

        //  Parameters
        final Map<String, Object> paramMap = new HashMap<>();

  # (This is the usual way to get the proxy-status with an out-of-cluster control plane.)
  istioctl ps --xds-address istio.cloudprovider.example.com:15012

  # Retrieve proxy status information via Kubernetes config, using token security
  # (This is the usual way to get the proxy-status with an in-cluster control plane.)
  istioctl proxy-status

from typing import Union

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(q: Union[str, None] = Query(default=None, alias="item-query")):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def root():