ID `baz` のitemのようにデフォルト値と同じ値を持つデータの場合:

```Python hl_lines="3  5-6"
{
    "name": "Baz",
    "description": None,
    "price": 50.2,
    "tax": 10.5,
    "tags": []
}
```

FastAPIは十分に賢いので（実際には、Pydanticが十分に賢い）、`description` や `tax`、`tags` がデフォルト値と同じ値であっても、明示的に設定された（デフォルトから取得されたのではない）ことを理解します。

そのため、それらはJSONレスポンスに含まれます。

/// tip | 豆知識

デフォルト値は `None` だけではないことに注意してください。

Это означает, что `item` может быть `int` или `str`.

#### Возможно `None` { #possibly-none }

Вы можете объявить, что значение может иметь определённый тип, например `str`, но также может быть и `None`.

//// tab | Python 3.10+

```Python hl_lines="1"
{!> ../../docs_src/python_types/tutorial009_py310.py!}
```

////

#         "//third_party/xla:copybara_library",
#     ],
#     visibility = ["//visibility:public"],
# )
#
# copybara_config_test(
#     name = "copybara_config_test",
#     config = "copy.bara.sky",
#     tags = [
#         "noasan",
#         "nodfsan",
#         "nogotsan",
#         "nogpu",
#         "nomsan",
#         "nosan",
#         "notsan",
#         "noubsan",
#     ],

  "fiscalYearStartMonth": 0,
  "gnetId": 15306,
  "graphTooltip": 0,
  "id": 285,
  "links": [
    {
      "icon": "external link",
      "includeVars": true,
      "keepTime": true,
      "tags": [
        "minio"
      ],
      "type": "dashboards"
    }
  ],
  "liveNow": false,
  "panels": [
    {
      "datasource": {
        "type": "prometheus",
        "uid": "${DS_PROMETHEUS}"

    }

    /**
     * <p>Escapes the characters in a <code>String</code> using Java String rules.</p>
     *
     * <p>Deals correctly with quotes and control-chars (tab, backslash, cr, ff, etc.) </p>
     *
     * <p>So a tab becomes the characters <code>'\\'</code> and
     * <code>'t'</code>.</p>
     *
     * <p>The only difference between Java strings and JavaScript strings

    }

    /**
     * <p>Escapes the characters in a <code>String</code> using Java String rules.</p>
     *
     * <p>Deals correctly with quotes and control-chars (tab, backslash, cr, ff, etc.) </p>
     *
     * <p>So a tab becomes the characters <code>'\\'</code> and
     * <code>'t'</code>.</p>
     *
     * <p>The only difference between Java strings and JavaScript strings

	}

	// Pass in relative days from current time, to additionally
	// to verify "object-lock-remaining-retention-days" policy if any.
	days := int(math.Ceil(math.Abs(objRetention.RetainUntilDate.Sub(t).Hours()) / 24))

	ret := objectlock.GetObjectRetentionMeta(oi.UserDefined)
	if ret.Mode.Valid() {
		// Retention has expired you may change whatever you like.

    configuring only OkHttp's TLS sockets.
 *  Fix: Prefer TLSv1.2 where it is available. On certain older platforms it is necessary to opt-in
    to TLSv1.2.
 *  New: `Request.tag()` permits multiple tags. Use a `Class<?>` as a key to identify tags. Note
    that `tag()` now returns null if the request has no tag. Previously this would return the
    request itself.
 *  New: `Headers.Builder.addAll(Headers)`.

			if lc.Rules[i].ID == otherRule.ID {
				return errLifecycleDuplicateID
			}
		}
	}
	return nil
}

// FilterRules returns the rules filtered by the status, prefix and tags
func (lc Lifecycle) FilterRules(obj ObjectOpts) []Rule {
	if obj.Name == "" {
		return nil
	}
	var rules []Rule
	for _, rule := range lc.Rules {
		if rule.Status == Disabled {
			continue
		}

      encodings[0x5] = encoding // Enquiry
      encodings[0x6] = encoding // Acknowledgment
      encodings[0x7] = encoding // Bell
      encodings['\b'.code] = encoding // Backspace
      encodings[0xb] = encoding // Vertical Tab
      encodings[0xe] = encoding // Shift Out
      encodings[0xf] = encoding // Shift In
      encodings[0x10] = encoding // Data Link Escape
      encodings[0x11] = encoding // Device Control 1 (oft. XON)