}


    public long dec_ndr_hyper () {
        align(8);
        long val = Encdec.dec_uint64le(this.buf, this.index);
        advance(8);
        return val;
    }


    /* float */
    /* double */
    public void enc_ndr_string ( String s ) {
        align(4);
        int i = this.index;
        int len = s.length();
        Encdec.enc_uint32le(len + 1, this.buf, i);
        i += 4;

{!> ../../docs_src/response_model/tutorial004.py!}
```

////

* `description: Union[str, None] = None` (или `str | None = None` в Python 3.10), где `None` является значением по умолчанию.
* `tax: float = 10.5`, где `10.5` является значением по умолчанию.
* `tags: List[str] = []`, где пустой список `[]` является значением по умолчанию.

но вы, возможно, хотели бы исключить их из ответа, если данные поля не были заданы явно.

pkg image/color, type NYCbCrA struct, A uint8
pkg image/color, type NYCbCrA struct, embedded YCbCr
pkg image/color, var NYCbCrAModel Model
pkg math/big, method (*Float) MarshalText() ([]uint8, error)
pkg math/big, method (*Float) UnmarshalText([]uint8) error
pkg math/big, method (*Int) Append([]uint8, int) []uint8
pkg math/big, method (*Int) Text(int) string
pkg math/rand, func Read([]uint8) (int, error)

```Python hl_lines="4  9 10 11 12  25 26 27"
from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    price: float
    is_offer: Union[bool, None] = None


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):

            return boost.toString();
        }
        return null;
    }

    public void setBoostValue(final String value) {
        if (value != null) {
            try {
                boost = Float.parseFloat(value);
            } catch (final Exception e) {}
        }
    }

    @Override
    public String getConfigId() {
        return ConfigType.FILE.getConfigId(getId());
    }

{* ../../docs_src/path_params_numeric_validations/tutorial005_an_py39.py hl[10] *}

## Validations numériques : flottants, supérieur et inférieur

Les validations numériques fonctionnent également pour les valeurs `float`.

[tool.ruff.lint.pyupgrade]
# Preserve types, even if a file imports `from __future__ import annotations`.
keep-runtime-typing = true

[tool.inline-snapshot]
# default-flags=["fix"]

	unset GOARM
	if [ "$GOARCH" = "arm5" ]; then
		export GOARCH=arm
		export GOARM=5
	fi

	# Build and vet everything.
	# cmd/go/internal/work/exec.go enables the same vet flags during go test of std cmd
	# and should be kept in sync with any vet flag changes here.
	if ! "$GOROOT/bin/go" build std cmd || ! "$GOROOT/bin/go" vet -unsafeptr=false std cmd; then
		failed=true
		if $sete; then
			exit 1

	child := &cobra.Command{
		Use: "child",
		Run: func(c *cobra.Command, args []string) {},
	}
	_ = parent.PersistentFlags().String(childFlag2, "", childFlag2)
	parent.AddCommand(child)

	// verify both parent flags and the child flag are visible by default
	parent.SetArgs([]string{"child", "--help"})
	if err := parent.Execute(); err != nil {
		t.Fatal(err)
	}
	got := out.String()
	out.Reset()

  virtual AbstractTensorInterface* CreateUint64Scalar(uint64 value) = 0;
  virtual AbstractTensorInterface* CreateInt32Scalar(int32_t value) = 0;
  virtual AbstractTensorInterface* CreateFloatScalar(float value) = 0;
  virtual AbstractTensorInterface* CreateDoubleScalar(double value) = 0;
  virtual AbstractTensorInterface* CreateHalfScalar(Eigen::half value) = 0;
  virtual AbstractTensorInterface* CreateStringScalar(tstring value) = 0;