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  2. github.com/tiangolo/fastapi

    docs_src/query_params_str_validations/tutorial004_regex_an_py310.py 

    from typing import Annotated

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(
    q: Annotated[
        str | None, Query(min_length=3, max_length=50, regex="^fixedquery$")
    ] = None,
):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Mon Nov 18 02:25:44 GMT 2024
    - 366 bytes
    - Click Count (0)
  3. github.com/tiangolo/fastapi

    docs_src/query_params_str_validations/tutorial007_an_py310.py 

    from typing import Annotated

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(
    q: Annotated[str | None, Query(title="Query string", min_length=3)] = None,
):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Tue Mar 26 16:56:53 GMT 2024
    - 337 bytes
    - Click Count (0)
  4. github.com/tiangolo/fastapi

    docs/zh/docs/advanced/events.md 

    ```

在 Python 中，  **上下文管理器**是一个你可以在 `with` 语句中使用的东西，例如，`open()` 可以作为上下文管理器使用。

```Python
with open("file.txt") as file:
    file.read()
```

Python 的最近几个版本也有了一个**异步上下文管理器**，你可以通过 `async with` 来使用：

```Python
async with lifespan(app):
    await do_stuff()
```

你可以像上面一样创建了一个上下文管理器或者异步上下文管理器，它的作用是在进入 `with` 块时，执行 `yield` 之前的代码，并且在离开 `with` 块时，执行 `yield` 后面的代码。

但在我们上面的例子里，我们并不是直接使用，而是传递给 FastAPI 来供其使用。
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Oct 11 17:48:49 GMT 2025
    - 7K bytes
    - Click Count (0)
  5. github.com/tiangolo/fastapi

    docs_src/cors/tutorial001_py39.py 

        "http://localhost:8080",
]

app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


@app.get("/")
async def main():
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 459 bytes
    - Click Count (0)
  6. github.com/tiangolo/fastapi

    docs_src/path_params_numeric_validations/tutorial004_an_py39.py 

    from typing import Annotated

from fastapi import FastAPI, Path

app = FastAPI()


@app.get("/items/{item_id}")
async def read_items(
    item_id: Annotated[int, Path(title="The ID of the item to get", ge=1)], q: str
):
    results = {"item_id": item_id}
    if q:
        results.update({"q": q})
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Mar 18 12:29:59 GMT 2023
    - 317 bytes
    - Click Count (0)
  7. github.com/tiangolo/fastapi

    docs_src/query_params_str_validations/tutorial004_an_py39.py 

    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, max_length=50, pattern="^fixedquery$")
    ] = None,
):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Tue Oct 24 20:26:06 GMT 2023
    - 381 bytes
    - Click Count (0)
  8. github.com/tiangolo/fastapi

    docs_src/settings/app02_an_py39/main.py 

    from typing import Annotated

from fastapi import Depends, FastAPI

from .config import Settings

app = FastAPI()


@lru_cache
def get_settings():
    return Settings()


@app.get("/info")
async def info(settings: Annotated[Settings, Depends(get_settings)]):
    return {
        "app_name": settings.app_name,
        "admin_email": settings.admin_email,
        "items_per_user": settings.items_per_user,
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Tue Oct 24 20:26:06 GMT 2023
    - 445 bytes
    - Click Count (0)
  9. github.com/tiangolo/fastapi

    docs_src/header_param_models/tutorial001_an_py310.py 

    
class CommonHeaders(BaseModel):
    host: str
    save_data: bool
    if_modified_since: str | None = None
    traceparent: str | None = None
    x_tag: list[str] = []


@app.get("/items/")
async def read_items(headers: Annotated[CommonHeaders, Header()]):
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Tue Sep 17 18:54:10 GMT 2024
    - 392 bytes
    - Click Count (0)
  10. github.com/tiangolo/fastapi

    docs_src/path_operation_configuration/tutorial001_py310.py 

        name: str
    description: str | None = None
    price: float
    tax: float | None = None
    tags: set[str] = set()


@app.post("/items/", response_model=Item, status_code=status.HTTP_201_CREATED)
async def create_item(item: Item):
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Fri Jan 07 14:11:31 GMT 2022
    - 363 bytes
    - Click Count (0)
  11. github.com/tiangolo/fastapi

    docs_src/custom_response/tutorial004_py39.py 

            <body>
            <h1>Look ma! HTML!</h1>
        </body>
    </html>
    """
    return HTMLResponse(content=html_content, status_code=200)


@app.get("/items/", response_class=HTMLResponse)
async def read_items():
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 491 bytes
    - Click Count (0)
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