return &testOneByteReadNoEOF{false, data}
}

// testOneByteReadNoEOF - implements io.Reader which returns 1 byte and nil error, but
// returns io.EOF on the next Read().
type testOneByteReadNoEOF struct {
	eof  bool
	data []byte
}

func (r *testOneByteReadNoEOF) Read(p []byte) (n int, err error) {
	if r.eof {
		return 0, io.EOF
	}
	n = copy(p, r.data)
	r.eof = true
	return n, nil
}

You can read more at the end of this page.

///

## `Field` additional arguments

When using `Field()` with Pydantic models, you can also declare additional `examples`:

//// tab | Python 3.10+

			// Ignore trace logs beyond the following conditions
			for _, name := range matchingFuncNames {
				if funcName == name {
					return trace
				}
			}
		}
		traceLevel++
		// Read stack trace information from PC
		pc, file, lineNumber, ok = runtime.Caller(traceLevel)
	}
	return trace
}

// HashString - return the highway hash of the passed string
func HashString(input string) string {

We see that we are going to need some dependencies used in several places of the application.

So we put them in their own `dependencies` module (`app/dependencies.py`).

We will now use a simple dependency to read a custom `X-Token` header:

//// tab | Python 3.9+

```Python hl_lines="3  6-8" title="app/dependencies.py"
{!> ../../docs_src/bigger_applications/app_an_py39/dependencies.py!}
```

////

      +  "-----END CERTIFICATE-----");

  private final OkHttpClient client;

  public CustomTrust() {
    // This implementation just embeds the PEM files in Java strings; most applications will
    // instead read this from a resource file that gets bundled with the application.

    HandshakeCertificates certificates = new HandshakeCertificates.Builder()
        .addTrustedCertificate(letsEncryptCertificateAuthority)

        if (StringUtil.isNotBlank(value)) {
            try {
                readInterval = Long.parseLong(value);
            } catch (final NumberFormatException e) {
                logger.warn("Invalid read interval: {}", value);
            }
        }
        return readInterval;
    }

    protected void sleep(final long interval) {
        ThreadUtil.sleepQuietly(interval);
    }

                param.setSourceRegion(new Rectangle(width, height > width ? width : height));
                final BufferedImage image = reader.read(0, param);
                final int thumbnailWidth = fessConfig.getThumbnailHtmlImageThumbnailWidthAsInteger();
                final int thumbnailHeight = (int) ((height > width ? width : height)

) (validation.Warning, error) {
	yamlReader := kubeyaml.NewYAMLReader(bufio.NewReader(reader))
	var errs error
	var warnings validation.Warning
	for {
		doc, err := yamlReader.Read()
		if err == io.EOF {
			return warnings, errs
		}
		if err != nil {
			errs = multierror.Append(errs, multierror.Prefix(err, fmt.Sprintf("failed to decode file %s: ", path)))
			return warnings, errs
		}

}

func TestErasureEncodeDecode(t *testing.T) {
	data := make([]byte, 256)
	if _, err := io.ReadFull(rand.Reader, data); err != nil {
		t.Fatalf("Failed to read random data: %v", err)
	}
	for i, test := range erasureEncodeDecodeTests {
		buffer := make([]byte, len(data), 2*len(data))
		copy(buffer, data)

)

// errOutOfEntropy indicates that the a source of randomness (PRNG) wasn't able
// to produce enough random data. This is fatal error and should cause a panic.