## Pydantic v1 en v2 { #pydantic-v1-in-v2 }

Pydantic v2 incluye todo lo de Pydantic v1 como un submódulo `pydantic.v1`.

Esto significa que puedes instalar la versión más reciente de Pydantic v2 e importar y usar los componentes viejos de Pydantic v1 desde ese submódulo, como si tuvieras instalado el Pydantic v1 antiguo.

            plugins.add(newPlugin("maven-surefire-plugin", "test"));
            plugins.add(newPlugin("maven-jar-plugin", "jar"));
            plugins.add(newPlugin("maven-install-plugin", "install"));
            plugins.add(newPlugin("maven-deploy-plugin", "deploy"));
        } else {
            plugins = Collections.emptySet();
        }

        return plugins;
    }

        "package", "org.apache.maven.plugins:maven-ejb-plugin:" + EJB_PLUGIN_VERSION + ":ejb",
        "install", "org.apache.maven.plugins:maven-install-plugin:" + INSTALL_PLUGIN_VERSION + ":install",
        "deploy", "org.apache.maven.plugins:maven-deploy-plugin:" + DEPLOY_PLUGIN_VERSION + ":deploy"
    };
    // END SNIPPET: ejb

    @Inject

        "package", "org.apache.maven.plugins:maven-jar-plugin:" + JAR_PLUGIN_VERSION + ":jar,",
        "install", "org.apache.maven.plugins:maven-install-plugin:" + INSTALL_PLUGIN_VERSION + ":install",
        "deploy", "org.apache.maven.plugins:maven-deploy-plugin:" + DEPLOY_PLUGIN_VERSION + ":deploy"
    };
    // END SNIPPET: maven-plugin

    @Inject

            throws RepositoryMetadataDeploymentException;

    /**
     * Install the metadata in the local repository.
     *
     * @param metadata        the metadata
     * @param localRepository the local repository
     * @throws RepositoryMetadataInstallationException in case of metadata installation issue
     */
    void install(ArtifactMetadata metadata, ArtifactRepository localRepository)

        »»»

    Source (English):

        «««
        # Install Packages { #install-packages }
        »»»

    Translate with (German):

        «««
        # Pakete installieren { #install-packages }
        »»»

    Do NOT translate with (German):

        «««
        # Installieren Sie Pakete { #install-packages }
        »»»

    Source (English):

        «««

<div class="termy">

```console
$ pip install "fastapi[all]"

---> 100%
```

</div>

...이는 코드를 실행하는 서버로 사용할 수 있는 `uvicorn` 또한 포함하고 있습니다.

/// note | 참고

부분적으로 설치할 수도 있습니다.

애플리케이션을 운영 환경에 배포하려는 경우 다음과 같이 합니다:

```
pip install fastapi
```

추가로 서버 역할을 하는 `uvicorn`을 설치합니다:

```
pip install uvicorn
```

사용하려는 각 선택적인 의존성에 대해서도 동일합니다.

///

            </configuration>
          </execution>
          <execution>
            <id>install</id>
            <phase>generate-sources</phase>
            <goals>
              <goal>set</goal>
              <goal>attach-pom</goal>
              <goal>install</goal>
            </goals>
            <configuration>
              <mainFile>dependency-1.jar</mainFile>
            </configuration>

```
fastapi>=0.68.0,<0.69.0
pydantic>=1.8.0,<2.0.0
uvicorn>=0.15.0,<0.16.0
```

你通常会使用`pip`安装这些依赖项：

<div class="termy">

```console
$ pip install -r requirements.txt
---> 100%
Successfully installed fastapi pydantic uvicorn
```

</div>

/// info

还有其他文件格式和工具来定义和安装依赖项。

 我将在下面的部分中向你展示一个使用 Poetry 的示例。 👇

///

### 创建 **FastAPI** 代码

## Install `websockets` { #install-websockets }

Make sure you create a [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and install `websockets` (a Python library that makes it easy to use the "WebSocket" protocol):

<div class="termy">

```console
$ pip install websockets

---> 100%
```

</div>