* 檔案 `app/routers/items.py` 在一個套件 `app/routers/` 內，因此它是一個子模組：`app.routers.items`。
* 同樣地，`app/routers/users.py` 是另一個子模組：`app.routers.users`。
* 還有一個子目錄 `app/internal/`，裡面有另一個 `__init__.py` 檔案，所以它又是一個「Python 子套件」：`app.internal`。
* 檔案 `app/internal/admin.py` 是另一個子模組：`app.internal.admin`。

<img src="/img/tutorial/bigger-applications/package.drawio.svg">

同樣的檔案結構，附上註解：

```bash
.
├── app                  # 「app」是一個 Python 套件

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 okhttp3.MediaType.Companion.toMediaType
import okhttp3.MediaType.Companion.toMediaTypeOrNull
import okhttp3.RequestBody.Companion.toRequestBody
import okhttp3.internal.addHeaderLenient
import okhttp3.internal.cacheGet
import okhttp3.internal.platform.Platform.Companion.get
import okhttp3.java.net.cookiejar.JavaNetCookieJar
import okhttp3.testing.PlatformRule
import okio.Buffer
import okio.BufferedSink

 * 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

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

import jcifs.SmbResource;
import jcifs.SmbResourceLocator;
import jcifs.internal.smb1.com.SmbComBlankResponse;
import jcifs.internal.smb1.com.SmbComFindClose2;
import jcifs.internal.smb1.trans.SmbComTransaction;
import jcifs.internal.smb1.trans2.Trans2FindFirst2;
import jcifs.internal.smb1.trans2.Trans2FindFirst2Response;
import jcifs.internal.smb1.trans2.Trans2FindNext2;

* Das Gleiche gilt für `app/routers/users.py`, es ist ein weiteres Submodul: `app.routers.users`.
* Es gibt auch ein Unterverzeichnis `app/internal/` mit einer weiteren Datei `__init__.py`, es handelt sich also um ein weiteres „Python-Subpackage“: `app.internal`.
* Und die Datei `app/internal/admin.py` ist ein weiteres Submodul: `app.internal.admin`.

<img src="/img/tutorial/bigger-applications/package.drawio.svg">

Die gleiche Dateistruktur mit Kommentaren:

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.internal.smb1.com;

import java.util.Date;

import jcifs.Configuration;
import jcifs.internal.SmbBasicFileInfo;
import jcifs.internal.smb1.AndXServerMessageBlock;
import jcifs.internal.util.SMBUtil;
import jcifs.util.Hexdump;

/**
 * SMB1 NT Create AndX Response message.
 *

import mockwebserver3.MockResponse
import mockwebserver3.MockWebServer
import mockwebserver3.junit5.StartStop
import okhttp3.TestUtil.assumeNetwork
import okhttp3.internal.connectionAccessor
import okhttp3.internal.exchangeAccessor
import okhttp3.internal.platform.OpenJSSEPlatform
import okhttp3.testing.PlatformRule
import okhttp3.tls.HandshakeCertificates
import okhttp3.tls.HeldCertificate

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.internal.smb1.net;

import java.io.UnsupportedEncodingException;

import jcifs.Configuration;
import jcifs.internal.smb1.trans.SmbComTransaction;
import jcifs.internal.util.SMBUtil;

/**
 * SMB1 NetShareEnum request message for enumerating network shares on a server.