from typing import Union

from fastapi import FastAPI, Path
from pydantic import BaseModel
from typing_extensions import Annotated

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: Annotated[int, Path(title="The ID of the item to get", ge=0, le=1000)],

something(some_argument, some_keyword_argument="foo")
```

这就是 "可调用对象"。

## 类作为依赖项

您可能会注意到，要创建一个 Python 类的实例，您可以使用相同的语法。

举个例子:

```Python
class Cat:
    def __init__(self, name: str):
        self.name = name


fluffy = Cat(name="Mr Fluffy")
```

在这个例子中, `fluffy` 是一个 `Cat` 类的实例。

为了创建 `fluffy`，你调用了 `Cat` 。

所以，Python 类也是 **可调用对象**。

因此，在 **FastAPI** 中，你可以使用一个 Python 类作为一个依赖项。

name: Enhancement Tracking Issue
description: Provide supporting details for a feature in development
labels: kind/feature
body:
  - type: textarea
    id: feature
    attributes:
      label: What would you like to be added?
      description: |
        Feature requests are unlikely to make progress as issues. Please consider engaging with SIGs on slack and mailing lists, instead.

import pytest
from fastapi.testclient import TestClient

from ...utils import needs_py39


@pytest.fixture(name="client")
def get_client():
    from docs_src.dependencies.tutorial008b_an_py39 import app

    client = TestClient(app)
    return client


@needs_py39
def test_get_no_item(client: TestClient):
    response = client.get("/items/foo")
    assert response.status_code == 404, response.text

# Copyright 2012 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.

# Run go tool dist to install a command.
# The -v causes dist to print the name of each directory as it runs.
# The -vv causes dist to print each build command as it runs.
# go tool dist clean cleans all directories, not just this one,
# but it's as close as we can get.

# Default target (first).

import model.CIBuildModel
import model.Stage

class BuildDistributions(model: CIBuildModel, stage: Stage) : OsAwareBaseGradleBuildType(os = LINUX, stage = stage, init = {
    id("${model.projectId}_BuildDistributions")
    name = "Build Distributions"
    description = "Creation and verification of the distribution and documentation"

    applyDefaults(
        model,
        this,
        "packageBuild",
        extraParameters =

    private boolean existNextPage;

    private List<Integer> pageNumberList;

    private int pageSize;

    private int currentPageNumber;

    public String id;

    public String name;

    public String paths;

    public String numOfThread;

    public String intervalTime;

    public String boost;

    public String available;

    public String sortOrder;

        }
    }

    protected void setupListCondition(final LabelTypeCB cb, final LabelTypePager labelTypePager) {
        if (StringUtil.isNotBlank(labelTypePager.name)) {
            cb.query().setName_Wildcard(wrapQuery(labelTypePager.name));
        }
        if (StringUtil.isNotBlank(labelTypePager.value)) {
            cb.query().setValue_Wildcard(wrapQuery(labelTypePager.value));
        }

        INTERFACES.put("samr", samr.getSyntax());
        INTERFACES.put("netdfs", netdfs.getSyntax());
    }

    public static void addInterface(String name, String syntax)
    {
        INTERFACES.put(name, syntax);
    }

    String proto;
    String server;
    String endpoint = null;
    HashMap options = null;
    UUID uuid = null;
    int major;
    int minor;

        if (reverse) {
            return !result;
        } else {
            return result;
        }
    }

    private boolean determineNameMatch(String name) {
        String test = name;
        boolean reverse = false;

        if (test.startsWith("!")) {
            reverse = true;
            test = test.substring(1);
        }