if (field.getType() == DependencyResolverResult.class) {
                    result = res;
                } else if (field.getType() == Node.class) {
                    result = res.getRoot();
                } else if (field.getType() == List.class && field.getGenericType() instanceof ParameterizedType pt) {

            // When
            var field = Handler.class.getField("DEFAULT_HTTPS_PORT");

            // Then
            assertTrue(Modifier.isPublic(field.getModifiers()));
            assertTrue(Modifier.isStatic(field.getModifiers()));
            assertTrue(Modifier.isFinal(field.getModifiers()));
            assertEquals(int.class, field.getType());
        }
    }

    @Nested

					for i := 0; i < reflect.ValueOf(got).NumField(); i++ {
						if fieldStruct := reflect.ValueOf(got).Type().Field(i); ast.IsExported(fieldStruct.Name) {
							exported = true
							field := reflect.ValueOf(got).Field(i)
							t.Run(fieldStruct.Name, func(t *testing.T) {
								AssertEqual(t, field.Interface(), reflect.ValueOf(expect).Field(i).Interface())
							})
						}
					}

					if exported {
						return
					}

from typing import Literal

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

app = FastAPI()


class FilterParams(BaseModel):
    limit: int = Field(100, gt=0, le=100)
    offset: int = Field(0, ge=0)
    order_by: Literal["created_at", "updated_at"] = "created_at"
    tags: list[str] = []


@app.get("/items/")
async def read_items(filter_query: FilterParams = Query()):

        final Map<TypeVariable<?>, Type> map = ParameterizedClassDescFactory.getTypeVariables(Hoge.class);
        final Field field = Hoge.class.getField("foo");
        final ParameterizedClassDesc desc = ParameterizedClassDescFactory.createParameterizedClassDesc(field, map);
        assertThat(desc.getRawClass(), is(sameClass(Map.class)));

        final ParameterizedClassDesc[] args = desc.getArguments();

可能你需要启动一个新版本，或者你只是你厌倦了运行它。 🤷

///

## 生命周期函数

首先要注意的是，我们定义了一个带有 `yield` 的异步函数。这与带有 `yield` 的依赖项非常相似。

```Python hl_lines="14-19"
{!../../docs_src/events/tutorial003.py!}
```

这个函数在 `yield`之前的部分，会在应用启动前执行。

剩下的部分在 `yield` 之后，会在应用完成后执行。

## 异步上下文管理器

如你所见，这个函数有一个装饰器 `@asynccontextmanager` 。

它将函数转化为所谓的“**异步上下文管理器**”。

```Python hl_lines="1  13"
{!../../docs_src/events/tutorial003.py!}
```

from typing import Annotated, Literal

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

app = FastAPI()


class FilterParams(BaseModel):
    model_config = {"extra": "forbid"}

    limit: int = Field(100, gt=0, le=100)
    offset: int = Field(0, ge=0)
    order_by: Literal["created_at", "updated_at"] = "created_at"
    tags: list[str] = []


@app.get("/items/")

        "detail": [
            {
                "loc": ["body", "name"],
                "input": {},
                "msg": "Field required",
                "type": "missing",
            },
            {
                "loc": ["body", "price"],
                "input": {},
                "msg": "Field required",
                "type": "missing",
            },
        ]
    }

            {
                "type": "missing",
                "loc": ["header", "x-token"],
                "msg": "Field required",
                "input": None,
            },
            {
                "type": "missing",
                "loc": ["header", "x-key"],
                "msg": "Field required",
                "input": None,
            },
        ]
    }

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}")