But Python has a specific way to declare lists with internal types, or "type parameters":

### Declare a `list` with a type parameter { #declare-a-list-with-a-type-parameter }

To declare types that have type parameters (internal types), like `list`, `dict`, `tuple`,
pass the internal type(s) as "type parameters" using square brackets: `[` and `]`

```Python
my_list: list[str]
```

}

// BenchmarkSelectAll_100K - benchmark * function with 100k records.
func BenchmarkSelectAll_100K(b *testing.B) {
	benchmarkSelectAll(b, 100*humanize.KiByte)
}

// BenchmarkSelectAll_1M - benchmark * function with 1m records.
func BenchmarkSelectAll_1M(b *testing.B) {
	benchmarkSelectAll(b, 1*humanize.MiByte)
}

// BenchmarkSelectAll_2M - benchmark * function with 2m records.
func BenchmarkSelectAll_2M(b *testing.B) {

### Read One Hero with `HeroPublic` { #read-one-hero-with-heropublic }

We can **read** a single hero:

{* ../../docs_src/sql_databases/tutorial002_an_py310.py ln[75:80] hl[77] *}

### Update a Hero with `HeroUpdate` { #update-a-hero-with-heroupdate }

We can **update a hero**. For this we use an HTTP `PATCH` operation.

* **X-Forwarded-Host**: The original host (`mysuperapp.com`)

When **FastAPI CLI** is configured with `--forwarded-allow-ips`, it trusts these headers and uses them, for example to generate the correct URLs in redirects.

## Proxy with a stripped path prefix { #proxy-with-a-stripped-path-prefix }

You could have a proxy that adds a path prefix to your application.

    client = TestClient(app)
    with pytest.raises(WebSocketDisconnect):
        with client.websocket_connect("/items/foo/ws"):
            pytest.fail(
                "did not raise WebSocketDisconnect on __enter__"
            )  # pragma: no cover


def test_websocket_invalid_data(app: FastAPI):
    client = TestClient(app)
    with pytest.raises(WebSocketDisconnect):

        run: echo "$GITHUB_CONTEXT"
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0
      - name: Set up Python
        uses: actions/setup-python@v6
        with:
          python-version: "3.11"
      - name: Setup uv
        uses: astral-sh/setup-uv@v7
        with:
          cache-dependency-glob: |
            requirements**.txt
            pyproject.toml

## Additional Response with `model` { #additional-response-with-model }

You can pass to your *path operation decorators* a parameter `responses`.

It receives a `dict`: the keys are status codes for each response (like `200`), and the values are other `dict`s with the information for each of them.

        run: echo "$GITHUB_CONTEXT"
      - uses: actions/checkout@v6
      - name: Set up Python
        uses: actions/setup-python@v6
        with:
          python-version: ${{ matrix.python-version }}
      - name: Setup uv
        uses: astral-sh/setup-uv@v7
        with:
          version: "0.4.15"
          enable-cache: true
          cache-dependency-glob: |
            requirements**.txt
            pyproject.toml

from pydantic import BaseModel


def test_invalid_sequence():
    with pytest.raises(AssertionError):
        app = FastAPI()

        class Item(BaseModel):
            title: str

        @app.get("/items/{id}")
        def read_items(id: list[Item]):
            pass  # pragma: no cover


def test_invalid_tuple():
    with pytest.raises(AssertionError):
        app = FastAPI()

    steps:
    - name: Set up Go 1.x
      uses: actions/setup-go@v4
      with:
        go-version: ${{ matrix.go }}

    - name: Check out code into the Go module directory
      uses: actions/checkout@v4

    - name: go mod package cache
      uses: actions/cache@v4
      with:
        path: ~/go/pkg/mod
        key: ${{ runner.os }}-go-${{ matrix.go }}-${{ hashFiles('tests/go.mod') }}