* 文件 `app/routers/items.py` 位于 `app/routers/` 包中，因此它是一个子模块：`app.routers.items`。
* 同样适用于 `app/routers/users.py`，它是另一个子模块：`app.routers.users`。
* 还有一个子目录 `app/internal/` 包含另一个 `__init__.py` 文件，因此它是又一个「Python 子包」：`app.internal`。
* `app/internal/admin.py` 是另一个子模块：`app.internal.admin`。

<img src="https://fastapi.tiangolo.com/img/tutorial/bigger-applications/package.drawio.svg">

带有注释的同一文件结构：

```
.

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal

import java.io.EOFException
import okio.BufferedSource

/**
 * Returns true if the body in question probably contains human-readable text. Uses a small

import jcifs.SmbFileHandle;
import jcifs.SmbPipeHandle;

/**
 * Internal interface for SMB pipe handle operations.
 *
 * This interface extends SmbPipeHandle with additional methods needed
 * for internal pipe management and provides access to low-level pipe details.
 *
 * @author mbechler
 *
 * <p>This interface is intended for internal use.</p>
 */
public interface SmbPipeHandleInternal extends SmbPipeHandle {

import org.apache.maven.execution.ProjectExecutionEvent;
import org.apache.maven.execution.ProjectExecutionListener;
import org.apache.maven.internal.transformation.TransformerManager;
import org.apache.maven.lifecycle.MavenExecutionPlan;
import org.apache.maven.lifecycle.internal.builder.BuilderCommon;
import org.apache.maven.plugin.MojoExecution;
import org.apache.maven.project.MavenProject;

/**
 * <p>

  <version>1.0.3</version>
  <packaging>jar</packaging>
  <name>Guava InternalFutureFailureAccess and InternalFutures</name>
  <description>
    Contains
    com.google.common.util.concurrent.internal.InternalFutureFailureAccess and
    InternalFutures. Most users will never need to use this artifact. Its
    classes are conceptually a part of Guava, but they're in this separate

import org.gradle.api.artifacts.result.ResolvedComponentResult
import org.gradle.api.file.RegularFileProperty
import org.gradle.api.tasks.Internal
import org.gradle.api.tasks.TaskAction
import org.gradle.internal.util.PropertiesUtils
import org.gradle.util.internal.VersionNumber
import org.gradle.work.DisableCachingByDefault
import java.util.Properties


@DisableCachingByDefault(because = "Not worth caching")

import jcifs.BaseTest;
import jcifs.Configuration;
import jcifs.internal.SMBProtocolDecodingException;
import jcifs.internal.TreeConnectResponse;
import jcifs.internal.smb2.ServerMessageBlock2;
import jcifs.internal.smb2.ServerMessageBlock2Request;
import jcifs.internal.smb2.ServerMessageBlock2Response;
import jcifs.internal.util.SMBUtil;

/**
 * Test class for Smb2TreeConnectResponse functionality
 */

import org.apache.maven.internal.impl.DefaultProject;
import org.apache.maven.internal.impl.DefaultSession;
import org.apache.maven.internal.impl.InternalMavenSession;
import org.apache.maven.model.Build;
import org.apache.maven.model.Model;
import org.apache.maven.model.root.RootLocator;
import org.apache.maven.plugin.descriptor.MojoDescriptor;
import org.apache.maven.plugin.descriptor.PluginDescriptor;

import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

import jcifs.SmbTransport;
import jcifs.internal.CommonServerMessageBlock;
import jcifs.internal.smb2.info.Smb2QueryInfoRequest;
import jcifs.internal.smb2.io.Smb2ReadRequest;

/**
 * Unit tests for ChannelLoadBalancer
 */
@ExtendWith(MockitoExtension.class)
class ChannelLoadBalancerTest {

    @Mock

 * limitations under the License.
 */
package okhttp3.internal.http

import java.io.IOException
import java.net.ProtocolException
import okhttp3.Headers
import okhttp3.Interceptor
import okhttp3.Response
import okhttp3.TrailersSource
import okhttp3.internal.UnreadableResponseBody
import okhttp3.internal.http2.ConnectionShutdownException
import okhttp3.internal.skipAll
import okio.buffer