typing - Code Search

docs_src/query_params_str_validations/tutorial010_py39.py

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",
        title="Query string",
        description="Query string for the items to search in the database that have a good match",
        min_length=3,
        max_length=50,
        pattern="^fixedquery$",
        deprecated=True,

Registered: Sun Dec 28 07:19:09 UTC 2025

- Last Modified: Wed Dec 17 20:41:43 UTC 2025

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github.com/tiangolo/fastapi

docs_src/websockets/tutorial002_an_py310.py

from typing import Annotated

from fastapi import (
    Cookie,
    Depends,
    FastAPI,
    Query,
    WebSocket,
    WebSocketException,
    status,
)
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">

Registered: Sun Dec 28 07:19:09 UTC 2025

- Last Modified: Sat Mar 18 12:29:59 UTC 2023

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github.com/tiangolo/fastapi

docs_src/schema_extra_example/tutorial004_py39.py

from typing import Union

from fastapi import Body, FastAPI
from pydantic import BaseModel

app = FastAPI()


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


@app.put("/items/{item_id}")
async def update_item(
    *,
    item_id: int,
    item: Item = Body(
        examples=[
            {
                "name": "Foo",

Registered: Sun Dec 28 07:19:09 UTC 2025

- Last Modified: Wed Dec 17 20:41:43 UTC 2025

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github.com/tiangolo/fastapi

docs_src/body_fields/tutorial001_py39.py

from typing import Union

from fastapi import Body, FastAPI
from pydantic import BaseModel, Field

app = FastAPI()


class Item(BaseModel):
    name: str
    description: Union[str, None] = Field(
        default=None, title="The description of the item", max_length=300
    )
    price: float = Field(gt=0, description="The price must be greater than zero")
    tax: Union[float, None] = None


@app.put("/items/{item_id}")

Registered: Sun Dec 28 07:19:09 UTC 2025

- Last Modified: Wed Dec 17 20:41:43 UTC 2025

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github.com/tiangolo/fastapi

docs_src/body_nested_models/tutorial007_py39.py

from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel, HttpUrl

app = FastAPI()


class Image(BaseModel):
    url: HttpUrl
    name: str


class Item(BaseModel):
    name: str
    description: Union[str, None] = None
    price: float
    tax: Union[float, None] = None
    tags: set[str] = set()
    images: Union[list[Image], None] = None


class Offer(BaseModel):
    name: str

Registered: Sun Dec 28 07:19:09 UTC 2025

- Last Modified: Sat May 14 11:59:59 UTC 2022

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github.com/tiangolo/fastapi

docs_src/body_fields/tutorial001_an_py39.py

from typing import Annotated, Union

from fastapi import Body, FastAPI
from pydantic import BaseModel, Field

app = FastAPI()


class Item(BaseModel):
    name: str
    description: Union[str, None] = Field(
        default=None, title="The description of the item", max_length=300
    )
    price: float = Field(gt=0, description="The price must be greater than zero")
    tax: Union[float, None] = None


@app.put("/items/{item_id}")

Registered: Sun Dec 28 07:19:09 UTC 2025

- Last Modified: Sat Mar 18 12:29:59 UTC 2023

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github.com/tiangolo/fastapi

docs_src/security/tutorial002_an_py310.py

from typing import Annotated

from fastapi import Depends, FastAPI
from fastapi.security import OAuth2PasswordBearer
from pydantic import BaseModel

app = FastAPI()

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")


class User(BaseModel):
    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


def fake_decode_token(token):
    return User(

Registered: Sun Dec 28 07:19:09 UTC 2025

- Last Modified: Sat Mar 18 12:29:59 UTC 2023

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github.com/tiangolo/fastapi

tests/test_openapi_schema_type.py

from typing import Optional, Union

import pytest
from fastapi.openapi.models import Schema, SchemaType


@pytest.mark.parametrize(
    "type_value",
    [
        "array",
        ["string", "null"],
        None,
    ],
)
def test_allowed_schema_type(
    type_value: Optional[Union[SchemaType, list[SchemaType]]],
) -> None:
    """Test that Schema accepts SchemaType, List[SchemaType] and None for type field."""

Registered: Sun Dec 28 07:19:09 UTC 2025

- Last Modified: Wed Dec 17 21:25:59 UTC 2025

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github.com/tiangolo/fastapi

docs_src/sql_databases/tutorial002_an_py39.py

from typing import Annotated, Union

from fastapi import Depends, FastAPI, HTTPException, Query
from sqlmodel import Field, Session, SQLModel, create_engine, select


class HeroBase(SQLModel):
    name: str = Field(index=True)
    age: Union[int, None] = Field(default=None, index=True)


class Hero(HeroBase, table=True):
    id: Union[int, None] = Field(default=None, primary_key=True)
    secret_name: str


class HeroPublic(HeroBase):

Registered: Sun Dec 28 07:19:09 UTC 2025

- Last Modified: Wed Oct 09 19:44:42 UTC 2024

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github.com/tiangolo/fastapi

docs_src/websockets/tutorial002_an_py39.py

from typing import Annotated, Union

from fastapi import (
    Cookie,
    Depends,
    FastAPI,
    Query,
    WebSocket,
    WebSocketException,
    status,
)
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <form action="" onsubmit="sendMessage(event)">

Registered: Sun Dec 28 07:19:09 UTC 2025

- Last Modified: Sat Mar 18 12:29:59 UTC 2023

- 2.8K bytes

- Viewed (0)

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