node[1] = B(hex_to_bin(arr, 26, 2));
        node[2] = B(hex_to_bin(arr, 28, 2));
        node[3] = B(hex_to_bin(arr, 30, 2));
        node[4] = B(hex_to_bin(arr, 32, 2));
        node[5] = B(hex_to_bin(arr, 34, 2));
    }

    public String toString() {
        return bin_to_hex(time_low, 8) + '-' +
                bin_to_hex(time_mid, 4) + '-' +
                bin_to_hex(time_hi_and_version, 4) + '-' +

	Red         = "\033[31m"
	Green       = "\033[32m"
	Yellow      = "\033[33m"
	Blue        = "\033[34m"
	Magenta     = "\033[35m"
	Cyan        = "\033[36m"
	White       = "\033[37m"
	BlueBold    = "\033[34;1m"
	MagentaBold = "\033[35;1m"
	RedBold     = "\033[31;1m"
	YellowBold  = "\033[33;1m"
)

// LogLevel log level
type LogLevel int

const (
	// Silent silent log level
	Silent LogLevel = iota + 1

更新部分数据时，可以在 Pydantic 模型的 `.dict()` 中使用 `exclude_unset` 参数。

比如，`item.dict(exclude_unset=True)`。

这段代码生成的 `dict` 只包含创建 `item` 模型时显式设置的数据，而不包括默认值。

然后再用它生成一个只含已设置（在请求中所发送）数据，且省略了默认值的 `dict`：

```Python hl_lines="34"
{!../../../docs_src/body_updates/tutorial002.py!}
```

### 使用 Pydantic 的 `update` 参数

接下来，用 `.copy()` 为已有模型创建调用 `update` 参数的副本，该参数为包含更新数据的 `dict`。

例如，`stored_item_model.copy(update=update_data)`：

                </mxCell>
                <mxCell id="11" value="&lt;font face=&quot;roboto&quot;&gt;&lt;span style=&quot;font-size: 24px&quot;&gt;Process&amp;nbsp;&lt;/span&gt;&lt;/font&gt;&lt;span style=&quot;font-family: &amp;#34;roboto&amp;#34; ; font-size: 24px&quot;&gt;Manager&lt;/span&gt;" style="shape=hexagon;perimeter=hexagonPerimeter2;whiteSpace=wrap;html=1;fixedSize=1;strokeWidth=3;fillColor=#d5e8d4;strokeColor=#82b366;" parent="1" vertex="1">

 * JMORRIS2        <20>  UNIQUE      Registered
 * BILLING-NY      <1E>  GROUP       Registered
 * JMORRIS         <03>  UNIQUE      Registered
 * 
 * MAC Address = 00-B0-34-21-FA-3B
 * </pre>
 * 
 * </blockquote>
 * <p>
 * The hostname of this machine is <code>JMORRIS2</code>. It is
 * a member of the group(a.k.a workgroup and domain) <code>BILLING-NY</code>. To

        sb.append(" 0x").append(Hexdump.toHexString(this.access, 8)).append(' ');
        sb.append(isInherited() ? "Inherited " : "Direct    ");
        appendCol(sb, getApplyToText(), 34);
        return sb.toString();
    }

	MOVHU	0x22(R9), R8         // MOVHU 34(R9), R8          // b282d9e1
	MOVHU.W	0x22(R9), R8         // MOVHU.W 34(R9), R8        // b282f9e1
	MOVHU.P	0x22(R9), R8         // MOVHU.P 34(R9), R8        // b282d9e0
	MOVH	0x22(R9), R8         // MOVH 34(R9), R8           // f282d9e1
	MOVH.W	0x22(R9), R8         // MOVH.W 34(R9), R8         // f282f9e1
	MOVH.P	0x22(R9), R8         // MOVH.P 34(R9), R8         // f282d9e0

        final Plugin plugin = mojoDescriptor.getPluginDescriptor().getPlugin();
        plugin.setLocation("version", new InputLocation(12, 34, defaultBindings));
        MojoExecution result = new MojoExecution(plugin, goal, executionId);
        result.setConfiguration(new XmlNodeImpl(executionId + "-" + goal));
        result.setMojoDescriptor(mojoDescriptor);

    assertThat(formEncode(31)).isEqualTo("%1F")
    // Browsers use '+' for space.
    assertThat(formEncode(32)).isEqualTo("+")
    assertThat(formEncode(33)).isEqualTo("%21")
    assertThat(formEncode(34)).isEqualTo("%22")
    assertThat(formEncode(35)).isEqualTo("%23")
    assertThat(formEncode(36)).isEqualTo("%24")
    assertThat(formEncode(37)).isEqualTo("%25")
    assertThat(formEncode(38)).isEqualTo("%26")

        sb.append( " 0x" ).append( Hexdump.toHexString( access, 8 )).append(' ');
        sb.append(isInherited() ? "Inherited " : "Direct    ");
        appendCol(sb, getApplyToText(), 34);
        return sb.toString();
    }