* </ul>
 *
 * <h2>Usage Example</h2>
 *
 * <pre>
 * {@code
 * Session session = ... // Obtain a Maven session
 * Packaging packaging = session.requirePackaging("jar");
 * System.out.println(packaging.getId()); // Outputs "jar"
 * }
 * </pre>
 *
 * @see org.apache.maven.api.Session#requirePackaging(String)
 * @see org.apache.maven.api.Project#getPackaging()

            if (prev != null) {
                int compare = prev.compareTo(c);
                System.out.println(
                        "   " + prev + ' ' + ((compare == 0) ? "==" : ((compare < 0) ? "<" : ">")) + ' ' + version);
            }

            System.out.println(
                    (i++) + ". " + version + " -> " + c.getCanonical() + "; tokens: " + c.items.toListString());

            prev = c;

		l.IDMap[id] = prev
		shouldLog = false
	}
	l.Unlock()

	if shouldLog {
		logIf(ctx, subsystem, err, errKind...)
	}
}

// Cleanup the map every one hour so that the log message is printed again for the user to notice.
func (l *logOnceType) cleanupRoutine() {
	for {
		time.Sleep(time.Hour)

		l.Lock()
		l.IDMap = make(map[string]onceErr)
		l.Unlock()
	}
}

				start = i
			}
			i += size
		}
		if start >= 0 {
			yield(s[start:len(s):len(s)])
		}
	}
}

// FieldsFuncSeq returns an iterator over subslices of s split around runs of
// Unicode code points satisfying f(c).
// The iterator yields the same subslices that would be returned by [FieldsFunc](s),
// but without constructing a new slice containing the subslices.

	if err != nil {
		t.Fatalf("open test connection failed, err: %+v", err)
	}

	count := 3

	var languages []Language
	for i := 0; i < count; i++ {
		language := Language{Code: fmt.Sprintf("consurrent %d", i)}
		db.Create(&language)
		languages = append(languages, language)
	}

	user := User{}
	db.Create(&user)
	db.Preload("Languages").FirstOrCreate(&user)

	var wg sync.WaitGroup

	tags["merrs"] = joinErrs(errs)
	tags["derrs"] = fmt.Sprintf("%v", dataErrsByPart)
	if m.IsValid() {
		tags["sz"] = strconv.FormatInt(m.Size, 10)
		tags["mt"] = m.ModTime.Format(iso8601Format)
		tags["d:p"] = fmt.Sprintf("%d:%d", m.Erasure.DataBlocks, m.Erasure.ParityBlocks)
	} else {
		tags["invalid"] = "1"
		tags["d:p"] = fmt.Sprintf("%d:%d", er.setDriveCount-er.defaultParityCount, er.defaultParityCount)
	}

		t.Skip("skipping in short mode")
	}
	buf := new(strings.Builder)
	w := NewWriter(buf)
	const nFiles = (1 << 16) + 42
	for i := 0; i < nFiles; i++ {
		_, err := w.CreateHeader(&FileHeader{
			Name:   fmt.Sprintf("%d.dat", i),
			Method: Store, // Deflate is too slow when it is compiled with -race flag
		})
		if err != nil {
			t.Fatalf("creating file %d: %v", i, err)
		}
	}
	if err := w.Close(); err != nil {

```

就能以如下方式调用：

```Python
user_dict = user_in.dict()
```

现在，变量 `user_dict`中的就是包含数据的**字典**（变量 `user_dict` 是字典，不是 Pydantic 模型对象）。

以如下方式调用：

```Python
print(user_dict)
```

输出的就是 Python **字典**：

```Python
{
    'username': 'john',
    'password': 'secret',
    'email': '******@****.***',
    'full_name': None,
}
```

#### 解包 `dict`

}

func newSSHConnMock(username string) ssh.ConnMetadata {
	return &MockConnMeta{username: username}
}

func TestSFTPAuthentication(t *testing.T) {
	for i, testCase := range iamTestSuites {
		t.Run(
			fmt.Sprintf("Test: %d, ServerType: %s", i+1, testCase.ServerTypeDescription),
			func(t *testing.T) {
				c := &check{t, testCase.serverType}
				suite := testCase

				suite.SetUpSuite(c)

				suite.SFTPServiceAccountLogin(c)

                for (ModelProblem problem : modelBuildingException.getProblems()) {
                    message += problem + "\n";
                }
                System.out.println(message);
            }

            throw e;
        }
    }

    protected MavenProject getProject(File pom) throws Exception {
        ProjectBuildingRequest configuration = newBuildingRequest();