func (r testNonEmptyReader) Read(b []byte) (int, error) {
	if len(b) == 0 {
		return 0, errors.New("unexpected empty Read call")
	}
	return r.Reader.Read(b)
}

func TestFileReader(t *testing.T) {
	type (
		testRead struct { // Read(cnt) == (wantStr, wantErr)
			cnt     int
			wantStr string
			wantErr error
		}

 *       to close resources will be thrown from the finally block. The throwable from the try block
 *       will be thrown.
 *   <li>If no exceptions or errors were thrown in the try block, the <i>first</i> exception thrown
 *       by an attempt to close a resource will be thrown.
 *   <li>Any exception caught when attempting to close a resource that is <i>not</i> thrown (because

	formatNamespace = "namespace"
)

const (
	logSubsys = "notify"
)

func logOnceIf(ctx context.Context, err error, id string, errKind ...interface{}) {
	logger.LogOnceIf(ctx, logSubsys, err, id, errKind...)
}

// ErrTargetsOffline - Indicates single/multiple target failures.
var ErrTargetsOffline = errors.New("one or more targets are offline. Please use `mc admin info --json` to check the offline targets")

	"cmd/internal/src"
	"cmd/internal/sys"
)

type Parser struct {
	lex           lex.TokenReader
	lineNum       int   // Line number in source file.
	errorLine     int   // Line number of last error.
	errorCount    int   // Number of errors.
	sawCode       bool  // saw code in this file (as opposed to comments and blank lines)
	pc            int64 // virtual PC; count of Progs; doesn't advance for GLOBL or DATA.
	input         []lex.Token

 * that [get] was called. Updates and removals after the call do not impact ongoing reads.
 *
 * This class is tolerant of some I/O errors. If files are missing from the filesystem, the
 * corresponding entries will be dropped from the cache. If an error occurs while writing a cache
 * value, the edit will fail silently. Callers should handle other problems by catching
 * `IOException` and responding appropriately.
 *

But adding the type annotations will allow your editor to give you better support and detect errors.

///

## Without Pydantic

```Python hl_lines="1 4"
{!../../docs_src/python_types/tutorial009.py!}
```

O uso de `Optional[str]` em vez de apenas `str` permitirá que o editor o ajude a detectar erros, onde você pode estar assumindo que um valor é sempre um `str`, quando na verdade também pode ser `None`.

`Optional[Something]` é na verdade um atalho para `Union[Something, None]`, eles são equivalentes.

	setCount := 2
	setDriveCount := 16

	format := newFormatErasureV3(setCount, setDriveCount)
	format.Erasure.DistributionAlgo = formatErasureVersionV2DistributionAlgoV1
	formats := make([]*formatErasureV3, 32)
	errs := make([]error, 32)

	for i := 0; i < setCount; i++ {
		for j := 0; j < setDriveCount; j++ {
			newFormat := format.Clone()
			newFormat.Erasure.This = format.Erasure.Sets[i][j]
			formats[i*setDriveCount+j] = newFormat

					VersionID: dobj.VersionID,
				},
				UserAgent: "Internal: [ILM-Expiry]",
				Host:      globalLocalNodeName,
			}
			if errs[i] != nil {
				evArgs.RespElements = map[string]string{
					"error": fmt.Sprintf("failed to delete %s(%s), with error %v", dobj.ObjectName, dobj.VersionID, errs[i]),
				}
			}
			sendEvent(evArgs)
		}
	}

		return cred, ErrSignatureDoesNotMatch
	}
	return cred, ErrNone
}

// Escape encodedQuery string into unescaped list of query params, returns error
// if any while unescaping the values.
func unescapeQueries(encodedQuery string) (unescapedQueries []string, err error) {
	for _, query := range strings.Split(encodedQuery, "&") {
		var unescapedQuery string
		unescapedQuery, err = url.QueryUnescape(query)
		if err != nil {