この場合、関数パラメータ `q` はオプショナルとなり、デフォルトでは `None` になります。

/// check | 確認

パスパラメータ `item_id` はパスパラメータであり、`q` はそれとは違ってクエリパラメータであると判別できるほど**FastAPI** が賢いということにも注意してください。

///

## クエリパラメータの型変換

`bool` 型も宣言できます。これは以下の様に変換されます:

{* ../../docs_src/query_params/tutorial003.py hl[9] *}

この場合、以下にアクセスすると:

```
http://127.0.0.1:8000/items/foo?short=1
```

もしくは、

```

package cmd

import (
	"testing"
)

func TestSplitPath(t *testing.T) {
	cases := []struct {
		path                          string
		secondIndex                   bool
		expectedListKey, expectedItem string
	}{
		{"format.json", false, "format.json", ""},
		{"users/tester.json", false, "users/", "tester.json"},
		{"groups/test/group.json", false, "groups/", "test/group.json"},

	// Bucket to scanner
	Bucket string

	// Directory inside the bucket.
	BaseDir string

	// Do a full recursive scan.
	Recursive bool

	// ReportNotFound will return errFileNotFound if all disks reports the BaseDir cannot be found.
	ReportNotFound bool

	// FilterPrefix will only return results with given prefix within folder.
	// Should never contain a slash.
	FilterPrefix string

                                        <la:message key="labels.dict_mapping_link_edit"/>
                                    </c:if>
                                </h3>
                                <div class="card-tools">
                                    <div class="btn-group">
                                        <la:link href="/admin/dict"
                                                 styleClass="btn btn-default btn-xs">

                                        <la:message key="labels.dict_stemmeroverride_link_details"/>
                                    </c:if>
                                </h3>
                                <div class="card-tools">
                                    <div class="btn-group">
                                        <la:link href="/admin/dict"
                                                 styleClass="btn btn-default btn-xs">

# Templates { #templates }

You can use any template engine you want with **FastAPI**.

A common choice is Jinja2, the same one used by Flask and other tools.

There are utilities to configure it easily that you can use directly in your **FastAPI** application (provided by Starlette).

## Install dependencies { #install-dependencies }

		nums[i-1] = 1 + ((start + i) % cardinality)
	}
	return nums
}

var (
	file, object, deploymentID, prefix string
	setCount, shards                   int
	verbose                            bool
)

func main() {
	flag.StringVar(&file, "file", "", "Read all objects from file, newline separated")
	flag.StringVar(&prefix, "prefix", "", "Add prefix to all objects")

			t.Fatalf("on line %d/2; ReadLine=%#v, %v; want non-nil line or Error, but not both",
				i+1, l, err)
		}
	}
}

type readLineResult struct {
	line     []byte
	isPrefix bool
	err      error
}

var readLineNewlinesTests = []struct {
	input  string
	expect []readLineResult
}{
	{"012345678901234\r\n012345678901234\r\n", []readLineResult{

    resetWithHole();
    assertEquals(c, navigableSet.higher(a));
    assertEquals(c, navigableSet.higher(b));
    assertEquals(null, navigableSet.higher(c));
  }

  /*
   * TODO(cpovirk): make "too small" and "too large" elements available for better navigation
   * testing. At that point, we may be able to eliminate the "hole" tests, which would mean that
   * ContiguousSet's tests would no longer need to suppress them.
   */

from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    price: float
    is_offer: Union[bool, None] = None


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):