第一步是安裝 FastAPI。

確保你建立一個[虛擬環境](../virtual-environments.md){.internal-link target=_blank}，啟用它，然後**安裝 FastAPI**：

<div class="termy">

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

---> 100%
```

</div>

/// note

當你使用 `pip install "fastapi[standard]"` 安裝時，會包含一些預設的可選標準依賴項。

如果你不想包含那些可選的依賴項，你可以使用 `pip install fastapi` 來安裝。

///

## 進階使用者指南

還有一個**進階使用者指南**你可以稍後閱讀。

                        LinkedHashMultiset.create(asList(elements)));
                  }
                })
            .named("ForwardingMultiset[LinkedHashMultiset] with standard implementations")
            .withFeatures(
                CollectionSize.ANY,
                CollectionFeature.ALLOWS_NULL_VALUES,
                CollectionFeature.GENERAL_PURPOSE)
            .createTestSuite());

            delegate.addExcludes(excludes);
        }

        return new ExclusionSetFilter(excludes);
    }

    /**
     * Returns the artifact filter for the standard core artifacts.
     *
     * @see org.apache.maven.ArtifactFilterManager#getCoreArtifactFilter()
     */
    @Override
    public ArtifactFilter getCoreArtifactFilter() {

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// Package ioutil implements some I/O utility functions which are not covered
// by the standard library.
package ioutil

import (
	"errors"
	"io"
)

// ErrOverread is returned to the reader when the hard limit of HardLimitReader is exceeded.

import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;

/**
 * Access to {@link Type} registry.
 * <p>
 * This registry provides access to all registered artifact types, both standard types
 * provided by Maven and custom types registered through SPI provider implementations.
 *
 * @since 4.0.0
 */
@Experimental
public interface TypeRegistry extends ExtensibleEnumRegistry<Type> {

    /**

<div class="termy">

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

---> 100%
```

</div>

////

//// tab | `uv`

Если у вас установлен <a href="https://github.com/astral-sh/uv" class="external-link" target="_blank">`uv`</a>:

<div class="termy">

```console
$ uv pip install "fastapi[standard]"
---> 100%
```

</div>

////

///

/// tip

Notice that in this case we are using a standard Python `open()` function that interacts with a file.

So, it involves I/O (input/output), that requires "waiting" for things to be written to disk.

But `open()` doesn't use `async` and `await`.

So, we declare the event handler function with standard `def` instead of `async def`.

///

/**
 * Service provider interface for registering custom {@link ProjectScope} implementations.
 * <p>
 * This interface allows plugins and extensions to define and register additional project scopes
 * beyond the standard {@link ProjectScope#MAIN} and {@link ProjectScope#TEST} scopes.
 * Implementations of this interface will be discovered through the Java ServiceLoader mechanism

/**
 * Service provider interface for registering custom {@link Language} implementations.
 * <p>
 * This interface allows plugins and extensions to define and register additional programming languages
 * beyond the standard ones provided by Maven. Implementations of this interface will be discovered
 * through the Java ServiceLoader mechanism and their provided languages will be available
 * throughout the Maven build process.
 * <p>

Verwenden Sie das `TestClient`-Objekt auf die gleiche Weise wie `httpx`.

Schreiben Sie einfache `assert`-Anweisungen mit den Standard-Python-Ausdrücken, die Sie überprüfen müssen (wiederum, Standard-`pytest`).

{* ../../docs_src/app_testing/tutorial001_py39.py hl[2,12,15:18] *}

/// tip | Tipp

Beachten Sie, dass die Testfunktionen normal `def` und nicht `async def` sind.