Predicate<String> equalsFoo = Predicates.equalTo("Foo");
    Predicate<String> equalsBar = Predicates.equalTo("Bar");
    Predicate<String> trimEqualsFoo = Predicates.compose(equalsFoo, trim);
    Function<String, String> identity = Functions.identity();

    assertTrue(trimEqualsFoo.apply("Foo"));
    assertTrue(trimEqualsFoo.apply("   Foo   "));
    assertFalse(trimEqualsFoo.apply("Foo-b-que"));

    new EqualsTester()

client = TestClient(app)


def test_path_operation():
    response = client.get("/items/foo")
    assert response.status_code == 200, response.text
    assert response.json() == {"id": "foo", "value": "there goes my hero"}


def test_path_operation_img():
    shutil.copy("./docs/en/docs/img/favicon.png", "./image.png")
    response = client.get("/items/foo?img=1")
    assert response.status_code == 200, response.text

        response = client.post(
            "/files/",
            data={"token": "foo"},
            files={"file": filea, "fileb": ("testb.txt", fileb, "text/plain")},
        )
    assert response.status_code == 200, response.text
    assert response.json() == {
        "file_size": 14,
        "token": "foo",
        "fileb_content_type": "text/plain",
    }

        response = client.post(
            "/files/",
            data={"token": "foo"},
            files={"file": filea, "fileb": ("testb.txt", fileb, "text/plain")},
        )
    assert response.status_code == 200, response.text
    assert response.json() == {
        "file_size": 14,
        "token": "foo",
        "fileb_content_type": "text/plain",
    }


@needs_py39

Wenn Sie dieses Beispiel ausführen und auf <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a> gehen, sehen Sie als Response:

```JSON
{"item_id":"foo"}
```

## Pfad-Parameter mit Typen

client = TestClient(app)


def test_post_items():
    response = client.post("/items/", json={"name": "Foo", "price": 5})
    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Item received"}


def test_post_users():
    response = client.post(
        "/users/", json={"username": "Foo", "email": "foo@example.com"}
    )
    assert response.status_code == 200, response.text

{!../../docs_src/path_params/tutorial001.py!}
```

💲 ➡ 🔢 `item_id` 🔜 🚶‍♀️ 👆 🔢 ❌ `item_id`.

, 🚥 👆 🏃 👉 🖼 &amp; 🚶 <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a>, 👆 🔜 👀 📨:

```JSON
{"item_id":"foo"}
```

## ➡ 🔢 ⏮️ 🆎

👆 💪 📣 🆎 ➡ 🔢 🔢, ⚙️ 🐩 🐍 🆎 ✍:

```Python hl_lines="7"
{!../../docs_src/path_params/tutorial002.py!}
```

Значение параметра пути `item_id` будет передано в функцию в качестве аргумента `item_id`.

Если запустите этот пример и перейдёте по адресу: <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a>, то увидите ответ:

```JSON
{"item_id":"foo"}
```

## Параметры пути с типами

Вы можете объявить тип параметра пути в функции, используя стандартные аннотации типов Python.

```Python hl_lines="7"

    assert response.status_code == 200, response.text
    assert response.json() == {"q": None}


def test_default_param_query():
    response = client.get("/items/?q=foo")
    assert response.status_code == 200, response.text

app = FastAPI()


class Item(BaseModel):
    name: str
    description: Union[str, None] = None
    price: float
    tax: float = 10.5
    tags: List[str] = []


items = {
    "foo": {"name": "Foo", "price": 50.2},
    "bar": {"name": "Bar", "description": "The bartenders", "price": 62, "tax": 20.2},
    "baz": {"name": "Baz", "description": None, "price": 50.2, "tax": 10.5, "tags": []},
}