if err != nil {
			return err
		}
		key := eventData.S3.Bucket.Name + "/" + objectName

		if eventData.EventName == event.ObjectRemovedDelete {
			_, err = target.deleteStmt.Exec(key)
		} else {
			var data []byte
			if data, err = json.Marshal(struct{ Records []event.Event }{[]event.Event{eventData}}); err != nil {
				return err
			}

			_, err = target.updateStmt.Exec(key, data)
		}

		return err

**FastAPI' nin** tamamı bu tür tip belirteçleri ile donatılmıştır ve birçok avantaj sağlamaktadır.

**FastAPI** kullanmayacak olsanız bile tür belirteçleri hakkında bilgi edinmenizde fayda var.

/// note | "Not"

Python uzmanıysanız ve tip belirteçleri ilgili her şeyi zaten biliyorsanız, sonraki bölüme geçin.

///

## Motivasyon

Basit bir örnek ile başlayalım:

```Python

	"github.com/minio/pkg/v3/policy"
)

type publicKeys struct {
	*sync.RWMutex

	// map of kid to public key
	pkMap map[string]interface{}
}

func (pk *publicKeys) parseAndAdd(b io.Reader) error {
	var jwk JWKS
	err := json.NewDecoder(b).Decode(&jwk)
	if err != nil {
		return err
	}

	for _, key := range jwk.Keys {
		pkey, err := key.DecodePublicKey()
		if err != nil {
			return err
		}

			return err
		}
		key := eventData.S3.Bucket.Name + "/" + objectName

		if eventData.EventName == event.ObjectRemovedDelete {
			_, err = conn.Do("HDEL", target.args.Key, key)
		} else {
			var data []byte
			if data, err = json.Marshal(struct{ Records []event.Event }{[]event.Event{eventData}}); err != nil {
				return err
			}

			_, err = conn.Do("HSET", target.args.Key, key, data)
		}

      HTTP_PERM_REDIRECT, HTTP_TEMP_REDIRECT, HTTP_MULT_CHOICE, HTTP_MOVED_PERM, HTTP_MOVED_TEMP, HTTP_SEE_OTHER -> true
      else -> false
    }

val Response.commonCacheControl: CacheControl
  get() {
    var result = lazyCacheControl
    if (result == null) {
      result = CacheControl.parse(headers)
      lazyCacheControl = result
    }
    return result
  }

fun Response.commonClose() {
  body.close()

type tierPermErr struct {
	Op  tierOp
	Err error
}

func (te tierPermErr) Error() string {
	return fmt.Sprintf("failed to perform %s: %v", te.Op, te.Err)
}

func errIsTierPermError(err error) bool {
	var tpErr tierPermErr
	return errors.As(err, &tpErr)
}

// remoteVersionID represents the version id of an object in the remote tier.
// Its usage is remote tier cloud implementation specific.
type remoteVersionID string

		l.Unlock()
	}
}

// Returns logOnceType
func newLogOnceType() *logOnceType {
	l := &logOnceType{IDMap: make(map[string]onceErr)}
	go l.cleanupRoutine()
	return l
}

var logOnce = newLogOnceType()

// LogOnceIf - Logs notification errors - once per error.
// id is a unique identifier for related log messages, refer to cmd/notification.go
// on how it is used.

}

// SetTags - sets key/val to ReqInfo.tags
func (r *ReqInfo) SetTags(key, val string) *ReqInfo {
	if r == nil {
		return nil
	}
	r.Lock()
	defer r.Unlock()
	// Search of tag key already exists in tags
	var updated bool
	for _, tag := range r.tags {
		if tag.Key == key {
			tag.Val = val
			updated = true
			break
		}
	}
	if !updated {
		// Append to the end of tags list

}

func (restClient *ReconnectRESTClient) IsLocal() bool {
	return false
}

// Close closes the underlying socket file descriptor.
func (restClient *ReconnectRESTClient) Close() error {
	return nil
}

var (
	errLockConflict = errors.New("lock conflict")
	errLockNotFound = errors.New("lock not found")
)

func toLockError(err error) error {
	if err == nil {
		return nil
	}

	switch err.Error() {

// If s does not end in a newline, the final yielded line will not end in a newline.
// It returns a single-use iterator.
func Lines(s []byte) iter.Seq[[]byte] {
	return func(yield func([]byte) bool) {
		for len(s) > 0 {
			var line []byte
			if i := IndexByte(s, '\n'); i >= 0 {
				line, s = s[:i+1], s[i+1:]
			} else {
				line, s = s, nil
			}
			if !yield(line[:len(line):len(line)]) {
				return
			}
		}
		return
	}
}