// padding is alwas binary 1 followed by binary 0s
        byte[] tail = new byte[padLen + 8];
        tail[0] = (byte)0x80;

        // append length before final transform:
        // save number of bits, casting the long to an array of 8 bytes
        // save low-order byte first.
        for (int i = 0; i < 8; i++)

{!../../docs_src/events/tutorial002.py!}
```

Hier schreibt die `shutdown`-Eventhandler-Funktion eine Textzeile `"Application shutdown"` in eine Datei `log.txt`.

/// info

In der Funktion `open()` bedeutet `mode="a"` „append“ („anhängen“), sodass die Zeile nach dem, was sich in dieser Datei befindet, hinzugefügt wird, ohne den vorherigen Inhalt zu überschreiben.

///

/// tip | "Tipp"

	var rinfo ResyncTargetsInfo
	target := globalBucketTargetSys.GetRemoteBucketTargetByArn(ctx, bucket, tgtArns[0])
	target.ResetBeforeDate = UTCNow().AddDate(0, 0, -1*int(days/24))
	target.ResetID = resetID
	rinfo.Targets = append(rinfo.Targets, ResyncTarget{Arn: tgtArns[0], ResetID: target.ResetID})
	if err = globalBucketTargetSys.SetTarget(ctx, bucket, &target, true); err != nil {
		switch err.(type) {
		case RemoteTargetConnectionErr:

        final StringBuffer urlBuf = request.getRequestURL();
        final String queryStr = request.getQueryString();
        if (queryStr != null) {
            urlBuf.append('?').append(queryStr);
        }

        final Map<String, List<String>> params = new HashMap<>();
        for (final Map.Entry<String, String[]> e : request.getParameterMap().entrySet()) {

			p.storage.setWriteAttribute(p.totalWrites.Add(1))
		}
		done(0, &err)
	}()

	// Copy inline data to a new buffer to function with deadlines.
	if len(fi.Data) > 0 {
		fi.Data = append(grid.GetByteBufferCap(len(fi.Data))[:0], fi.Data...)
	}
	return xioutil.WithDeadline[RenameDataResp](ctx, globalDriveConfig.GetMaxTimeout(), func(ctx context.Context) (res RenameDataResp, err error) {
		if len(fi.Data) > 0 {

       *   or it had already failed. (It couldn't have completed *successfully* or even had
       *   setFuture called on it: Neither of those can happen until we've finished processing all
       *   the completed inputs. And we're still processing at least one input, the one that
       *   triggered handleException.)
       *

        // workspace
        if (source == null) {
            try {
                source = container.lookup(ArtifactMetadataSource.class);
            } catch (ComponentLookupException e) {
                // won't happen
            }
        }

        if (listeners == null) {
            listeners = new ArrayList<>();

            if (logger.isDebugEnabled()) {

                if ( request != null ) {
                    request.setPath(dunc);
                }

                if ( !t.getShare().equals(dr.getShare()) ) {
                    // this should only happen for standalone roots or if the DC/domain root lookup failed
                    IOException last;
                    DfsReferralData start = dr;
                    do {
                        if ( log.isDebugEnabled() ) {

///

/// check

You don't have to worry about performance when including routers.

This will take microseconds and will only happen at startup.

So it won't affect performance. ⚡

///

### Include an `APIRouter` with a custom `prefix`, `tags`, `responses`, and `dependencies`

The same would happen if you had something like a <abbr title='A union between multiple types means "any of these types".'>union</abbr> between different types where one or more of them are not valid Pydantic types, for example this would fail 💥: