appendFile, err := lock.Open(dst, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0o666)
	if err != nil {
		return err
	}
	defer appendFile.Close()

	srcFile, err := lock.Open(src, os.O_RDONLY, 0o666)
	if err != nil {
		return err
	}
	defer srcFile.Close()
	_, err = io.Copy(appendFile, srcFile)
	return err

   * internal, unbounded pool at the first call to {@code addListener} and holding it until the
   * future is {@linkplain Future#isDone() done}.
   *
   * <p>Prefer to create {@code ListenableFuture} instances with {@link SettableFuture}, {@link
   * MoreExecutors#listeningDecorator( java.util.concurrent.ExecutorService)}, {@link

	return u.String(), nil
}

// Put - Adds DNS entries into operator webhook server
func (c *OperatorDNS) Put(bucket string) error {
	ctx, cancel := context.WithTimeout(context.Background(), defaultOperatorContextTimeout)
	defer cancel()
	e, err := c.endpoint(bucket, false)
	if err != nil {
		return newError(bucket, err)
	}
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, e, nil)
	if err != nil {
		return newError(bucket, err)

```

////

//// tab | Python 3.10+ non-Annotated

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="7  48  55-56  59-60  69-75"
{!> ../../docs_src/security/tutorial004_py310.py!}
```

////

//// tab | Python 3.8+ non-Annotated

/// tip

Prefer to use the `Annotated` version if possible.

///

			go func(clnt *bootstrapRESTClient) {
				defer wg.Done()

				if clnt.gridConn.State() != grid.StateConnected {
					mu.Lock()
					offlineEndpoints = append(offlineEndpoints, fmt.Errorf("%s is unreachable: %w", clnt, grid.ErrDisconnected))
					mu.Unlock()
					return
				}

				ctx, cancel := context.WithTimeout(ctx, 2*time.Second)
				defer cancel()

				err := clnt.Verify(ctx, srcCfg)

	}

	z.poolMetaMutex.Lock()
	defer z.poolMetaMutex.Unlock()

	z.poolMeta = meta
	return nil
}

func (z *erasureServerPools) DecommissionCancel(ctx context.Context, idx int) (err error) {
	if idx < 0 {
		return errInvalidArgument
	}

	if z.SinglePool() {
		return errInvalidArgument
	}

	z.poolMetaMutex.Lock()
	defer z.poolMetaMutex.Unlock()

			if err != nil {
				return nil, err
			}
			if err := f.Start(); err != nil {
				return nil, err
			}
			address = fmt.Sprintf("https://%s%s", f.Address(), *cc.Service.Path)
			defer func() {
				f.Close()
				f.WaitForStop()
			}()
		}
		tlsClientConfig.ServerName = fmt.Sprintf("%s.%s.%s", cc.Service.Name, cc.Service.Namespace, "svc")
	} else if isMCPAddr(address) {
		var err error

		pool := globalBytePoolCap.Load()
		bufA := pool.Get()
		bufB := pool.Get()
		defer pool.Put(bufA)
		defer pool.Put(bufB)
		ra, err := readahead.NewReaderBuffer(data, [][]byte{bufA[:fi.Erasure.BlockSize], bufB[:fi.Erasure.BlockSize]})
		if err == nil {
			toEncode = ra
			defer ra.Close()
		}
	}

	n, err := erasure.Encode(ctx, toEncode, writers, buffer, writeQuorum)

```

////

//// tab | Python 3.8+

```Python hl_lines="1"
{!> ../../docs_src/request_forms/tutorial001_an.py!}
```

////

//// tab | Python 3.8+ non-Annotated

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="1"
{!> ../../docs_src/request_forms/tutorial001.py!}
```

////

## Define `Form` parameters

package lock

import (
	"os"
	"testing"
	"time"
)

// Test lock fails.
func TestLockFail(t *testing.T) {
	f, err := os.CreateTemp("", "lock")
	if err != nil {
		t.Fatal(err)
	}
	f.Close()
	defer func() {
		err = os.Remove(f.Name())
		if err != nil {
			t.Fatal(err)
		}
	}()

	_, err = LockedOpenFile(f.Name(), os.O_APPEND, 0o600)
	if err == nil {
		t.Fatal("Should fail here")
	}
}