* 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.svg">

Die gleiche Dateistruktur mit Kommentaren:

```

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.internal.smb2.session;


import jcifs.CIFSContext;
import jcifs.internal.smb2.ServerMessageBlock2;
import jcifs.internal.smb2.ServerMessageBlock2Request;
import jcifs.internal.smb2.Smb2Constants;
import jcifs.internal.util.SMBUtil;


/**
 * @author mbechler
 *
 */

 * limitations under the License.
 */
package okhttp3.internal.platform.android

import javax.net.ssl.SSLSocket
import javax.net.ssl.SSLSocketFactory
import javax.net.ssl.X509TrustManager
import okhttp3.OkHttpClient
import okhttp3.internal.platform.Platform
import okhttp3.internal.readFieldOrNull

/**
 * Base Android reflection based SocketAdapter for the built in Android SSLSocket.

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

package jcifs.internal.smb1.com;


import jcifs.Configuration;
import jcifs.SmbConstants;
import jcifs.internal.smb1.ServerMessageBlock;
import jcifs.internal.util.SMBUtil;
import jcifs.util.Hexdump;


/**
 * 
 */
public class SmbComRename extends ServerMessageBlock {

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

package jcifs.internal.smb1.trans.nt;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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


/**
 * 
 */

import org.apache.maven.execution.DefaultMavenExecutionResult;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.internal.impl.DefaultLookup;
import org.apache.maven.internal.impl.DefaultSession;
import org.apache.maven.internal.impl.InternalMavenSession;
import org.apache.maven.internal.impl.InternalSession;
import org.apache.maven.model.building.ModelBuildingException;
import org.apache.maven.model.building.ModelProblem;

import java.util.Collections
import okhttp3.Cookie
import okhttp3.CookieJar
import okhttp3.HttpUrl
import okhttp3.internal.cookieToString
import okhttp3.internal.delimiterOffset
import okhttp3.internal.platform.Platform
import okhttp3.internal.platform.Platform.Companion.WARN
import okhttp3.internal.trimSubstring

/** A cookie jar that delegates to a [java.net.CookieHandler]. */

import java.nio.charset.Charset
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.internal.toImmutableList
import okhttp3.internal.url.FORM_ENCODE_SET
import okhttp3.internal.url.canonicalizeWithCharset
import okhttp3.internal.url.percentDecode
import okio.Buffer
import okio.BufferedSink

class FormBody internal constructor(
  encodedNames: List<String>,
  encodedValues: List<String>,
) : RequestBody() {

import java.util.concurrent.TimeUnit
import mockwebserver3.SocketPolicy.KeepOpen
import mockwebserver3.internal.toMockResponseBody
import okhttp3.ExperimentalOkHttpApi
import okhttp3.Headers
import okhttp3.Headers.Companion.headersOf
import okhttp3.WebSocketListener
import okhttp3.internal.addHeaderLenient
import okhttp3.internal.http2.Settings
import okio.Buffer

/** A scripted response to be replayed by the mock web server. */

* 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.svg">

带有注释的同一文件结构：

```
.