* <abbr title="Fügt sie zu einer Einheit zusammen. Mit dem Inhalt des einen nach dem anderen.">Verkettet</abbr> sie mit einem Leerzeichen in der Mitte.

{* ../../docs_src/python_types/tutorial001_py39.py hl[2] *}

### Es bearbeiten { #edit-it }

Es ist ein sehr einfaches Programm.

Aber nun stellen Sie sich vor, Sie würden es selbst schreiben.

Irgendwann sind die Funktions-Parameter fertig, Sie starten mit der Definition des Körpers ...

# 使用yield的依赖项

FastAPI支持在完成后执行一些<abbr title='有时也被称为"退出"("exit")，"清理"("cleanup")，"拆卸"("teardown")，"关闭"("close")，"上下文管理器"("context managers")。 ...'>额外步骤</abbr>的依赖项.

为此，你需要使用 `yield` 而不是 `return`，然后再编写这些额外的步骤（代码）。

/// tip | 提示

确保在每个依赖中只使用一次 `yield`。

///

/// note | 技术细节

任何一个可以与以下内容一起使用的函数：

#!/usr/bin/env bash

# shellcheck disable=SC2120
exit_1() {
	cleanup

	echo "minio1 ============"
	cat /tmp/minio1_1.log
	echo "minio2 ============"
	cat /tmp/minio2_1.log

	exit 1
}

cleanup() {
	echo -n "Cleaning up instances of MinIO ..."
	pkill -9 minio || sudo pkill -9 minio
	rm -rf /tmp/minio{1,2}
	echo "done"
}

# Function to convert number to corresponding alphabet
num_to_alpha() {
	local num=$1

	echo "minio1 ============"
	cat /tmp/minio1_1.log
	echo "minio2 ============"
	cat /tmp/minio2_1.log
	echo "minio3 ============"
	cat /tmp/minio3_1.log
	echo "minio4 ============"
	cat /tmp/minio4_1.log
	exit 1
}

cleanup() {
	echo -n "Cleaning up instances of MinIO ..."
	pkill -9 minio || sudo pkill -9 minio
	pkill -9 kes || sudo pkill -9 kes
	rm -rf ${PWD}/keys
	rm -rf /tmp/minio{1,2,3,4}
	echo "done"
}

// Code generated by github.com/tinylib/msgp DO NOT EDIT.

package cmd

import (
	"bytes"
	"testing"

	"github.com/tinylib/msgp/msgp"
)

func TestMarshalUnmarshalPoolDecommissionInfo(t *testing.T) {
	v := PoolDecommissionInfo{}
	bts, err := v.MarshalMsg(nil)
	if err != nil {
		t.Fatal(err)
	}
	left, err := v.UnmarshalMsg(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {

// Code generated by github.com/tinylib/msgp DO NOT EDIT.

package cmd

import (
	"bytes"
	"testing"

	"github.com/tinylib/msgp/msgp"
)

func TestMarshalUnmarshalBatchJobKV(t *testing.T) {
	v := BatchJobKV{}
	bts, err := v.MarshalMsg(nil)
	if err != nil {
		t.Fatal(err)
	}
	left, err := v.UnmarshalMsg(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {

// Code generated by github.com/tinylib/msgp DO NOT EDIT.

package cmd

import (
	"bytes"
	"testing"

	"github.com/tinylib/msgp/msgp"
)

func TestMarshalUnmarshalBatchJobKeyRotateEncryption(t *testing.T) {
	v := BatchJobKeyRotateEncryption{}
	bts, err := v.MarshalMsg(nil)
	if err != nil {
		t.Fatal(err)
	}
	left, err := v.UnmarshalMsg(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {

		}
	}
	send := func(entry metaCacheEntry) error {
		objReturned(entry.metadata)
		select {
		case <-ctx.Done():
			return ctx.Err()
		case out <- entry:
		}
		return nil
	}

	// Fast exit track to check if we are listing an object with
	// a trailing slash, this will avoid to list the object content.
	if HasSuffix(opts.BaseDir, SlashSeparator) {
		metadata, err := s.readMetadata(ctx, pathJoin(volumeDir,

// Code generated by github.com/tinylib/msgp DO NOT EDIT.

package cmd

import (
	"bytes"
	"testing"

	"github.com/tinylib/msgp/msgp"
)

func TestMarshalUnmarshalxlMetaDataDirDecoder(t *testing.T) {
	v := xlMetaDataDirDecoder{}
	bts, err := v.MarshalMsg(nil)
	if err != nil {
		t.Fatal(err)
	}
	left, err := v.UnmarshalMsg(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {

		o.ID = ""
		o.Transient = true
		return entries, errDiskFull
	}
	o.set = z.serverPools[o.pool].getHashedSetIndex(o.ID)
	saver := z.serverPools[o.pool].sets[o.set]

	// Disconnect from call above, but cancel on exit.
	listCtx, cancel := context.WithCancel(GlobalContext)
	saveCh := make(chan metaCacheEntry, metacacheBlockSize)
	inCh := make(chan metaCacheEntry, metacacheBlockSize)
	outCh := make(chan metaCacheEntry, o.Limit)