デフォルトでは、単数値はクエリパラメータとして解釈されるので、明示的に `Query` を追加する必要はありません。

```Python
q: str = None
```

以下において:

```Python hl_lines="27"
{!../../docs_src/body_multiple_params/tutorial004.py!}
```

/// info | "情報"

`Body`もまた、後述する `Query` や `Path` などと同様に、すべての検証パラメータとメタデータパラメータを持っています。

///

## 単一のボディパラメータの埋め込み

Pydanticモデル`Item`のボディパラメータ`item`を1つだけ持っているとしましょう。

デフォルトでは、**FastAPI**はそのボディを直接期待します。

      // as a signal that we should try checking if the future is done again.
      if (!isNullOrEmpty(pendingDescription)) {
        builder.append("PENDING, info=[").append(pendingDescription).append("]");
      } else if (isDone()) {
        addDoneString(builder);
      } else {
        builder.append("PENDING");
      }
    }
    return builder.append("]").toString();

# Ambientes Virtuais

Ao trabalhar em projetos Python, você provavelmente deve usar um **ambiente virtual** (ou um mecanismo similar) para isolar os pacotes que você instala para cada projeto.

/// info | "Informação"

Se você já sabe sobre ambientes virtuais, como criá-los e usá-los, talvez seja melhor pular esta seção. 🤓

///

/// tip | "Dica"

Um **ambiente virtual** é diferente de uma **variável de ambiente**.

.table-success:hover {\n  background-color: #b1dfbb;\n}\n\n.table-hover .table-success:hover > td,\n.table-hover .table-success:hover > th {\n  background-color: #b1dfbb;\n}\n\n.table-info,\n.table-info > th,\n.table-info > td {\n  background-color: #bee5eb;\n}\n\n.table-info th,\n.table-info td,\n.table-info thead th,\n.table-info tbody + tbody {\n  border-color: #86cfda;\n}\n\n.table-hover .table-info:hover {\n  background-color: #abdde5;\n}\n\n.table-hover .table-info:hover > td,\n.table-hover .table-info:hover...

 [kotlin]: https://kotlinlang.org/
 [okhttp3_pro]: https://raw.githubusercontent.com/square/okhttp/master/okhttp/src/main/resources/META-INF/proguard/okhttp3.pro
 [okhttp_312x]: https://github.com/square/okhttp/tree/okhttp_3.12.x
 [okhttp]: https://square.github.io/okhttp/
 [okio]: https://github.com/square/okio

import jcifs.internal.smb1.com.SmbComWrite;
import jcifs.internal.smb1.com.SmbComWriteAndX;
import jcifs.internal.smb1.com.SmbComWriteAndXResponse;
import jcifs.internal.smb1.com.SmbComWriteResponse;
import jcifs.internal.smb2.info.Smb2SetInfoRequest;
import jcifs.internal.smb2.io.Smb2WriteRequest;
import jcifs.internal.smb2.io.Smb2WriteResponse;


/**
 * This <code>OutputStream</code> can write bytes to a file on an SMB file server.
 */

my_user: User = User(id=3, name="John Doe", joined="2018-07-19")

second_user_data = {
    "id": 4,
    "name": "Mary",
    "joined": "2018-11-30",
}

my_second_user: User = User(**second_user_data)
```

/// info

`**second_user_data` ⛓:

🚶‍♀️ 🔑 & 💲 `second_user_data` #️⃣ 🔗 🔑-💲 ❌, 🌓: `User(id=4, name="Mary", joined="2018-11-30")`

///

### 👨‍🎨 🐕‍🦺

		}
	} else {
		apiRequestsMaxPerNode = cfg.RequestsMax
		if n := totalNodeCount(); n > 0 {
			apiRequestsMaxPerNode /= n
		}
	}

	if globalIsDistErasure {
		logger.Info("Configured max API requests per node based on available memory: %d", apiRequestsMaxPerNode)
	}

	if cap(t.requestsPool) != apiRequestsMaxPerNode {
		// Only replace if needed.

            setContext(contextBytes);
        }
        pos += 8;

        if ( targetNameOff < pos + 8 || input.length < pos + 8 ) {
            // no room for target info
            return;
        }

        byte[] targetInfo = readSecurityBuffer(input, pos);
        if ( targetInfo.length != 0 ) {
            setTargetInformation(targetInfo);
        }
    }

导入 `Enum` 并创建继承自 `str` 和 `Enum` 的子类。

通过从 `str` 继承，API 文档就能把值的类型定义为**字符串**，并且能正确渲染。

然后，创建包含固定值的类属性，这些固定值是可用的有效值：

```Python hl_lines="1  6-9"
{!../../docs_src/path_params/tutorial005.py!}
```

/// info | "说明"

Python 3.4 及之后版本支持<a href="https://docs.python.org/3/library/enum.html" class="external-link" target="_blank">枚举（即 enums）</a>。

///

/// tip | "提示"