Function Field

pydantic/fields.py:925–963

(
    default: ellipsis,  # noqa: F821  # TODO: use `_typing_extra.EllipsisType` when we drop Py3.9
    *,
    alias: str | None = _Unset,
    alias_priority: int | None = _Unset,
    validation_alias: str | AliasPath | AliasChoices | None = _Unset,
    serialization_alias: str | None = _Unset,
    title: str | None = _Unset,
    field_title_generator: Callable[[str, FieldInfo], str] | None = _Unset,
    description: str | None = _Unset,
    examples: list[Any] | None = _Unset,
    exclude: bool | None = _Unset,
    exclude_if: Callable[[Any], bool] | None = _Unset,
    discriminator: str | types.Discriminator | None = _Unset,
    deprecated: Deprecated | str | bool | None = _Unset,
    json_schema_extra: JsonDict | Callable[[JsonDict], None] | None = _Unset,
    frozen: bool | None = _Unset,
    validate_default: bool | None = _Unset,
    repr: bool = _Unset,
    init: bool | None = _Unset,
    init_var: bool | None = _Unset,
    kw_only: bool | None = _Unset,
    pattern: str | re.Pattern[str] | None = _Unset,
    strict: bool | None = _Unset,
    coerce_numbers_to_str: bool | None = _Unset,
    gt: annotated_types.SupportsGt | None = _Unset,
    ge: annotated_types.SupportsGe | None = _Unset,
    lt: annotated_types.SupportsLt | None = _Unset,
    le: annotated_types.SupportsLe | None = _Unset,
    multiple_of: float | None = _Unset,
    allow_inf_nan: bool | None = _Unset,
    max_digits: int | None = _Unset,
    decimal_places: int | None = _Unset,
    min_length: int | None = _Unset,
    max_length: int | None = _Unset,
    union_mode: Literal['smart', 'left_to_right'] = _Unset,
    fail_fast: bool | None = _Unset,
    **extra: Unpack[_EmptyKwargs],
)

class="cm"># to understand the magic that happens at runtime with the following overloads:
@overload  class="cm"># type hint the return value as `Any` to avoid type checking regressions when using `...`.
def Field(
    default: ellipsis,  class="cm"># noqa: F821  # TODO: use `_typing_extra.EllipsisType` when we drop Py3.9
    *,
    alias: str | None = _Unset,
    alias_priority: int | None = _Unset,
    validation_alias: str | AliasPath | AliasChoices | None = _Unset,
    serialization_alias: str | None = _Unset,
    title: str | None = _Unset,
    field_title_generator: Callable[[str, FieldInfo], str] | None = _Unset,
    description: str | None = _Unset,
    examples: list[Any] | None = _Unset,
    exclude: bool | None = _Unset,
    exclude_if: Callable[[Any], bool] | None = _Unset,
    discriminator: str | types.Discriminator | None = _Unset,
    deprecated: Deprecated | str | bool | None = _Unset,
    json_schema_extra: JsonDict | Callable[[JsonDict], None] | None = _Unset,
    frozen: bool | None = _Unset,
    validate_default: bool | None = _Unset,
    repr: bool = _Unset,
    init: bool | None = _Unset,
    init_var: bool | None = _Unset,
    kw_only: bool | None = _Unset,
    pattern: str | re.Pattern[str] | None = _Unset,
    strict: bool | None = _Unset,
    coerce_numbers_to_str: bool | None = _Unset,
    gt: annotated_types.SupportsGt | None = _Unset,
    ge: annotated_types.SupportsGe | None = _Unset,
    lt: annotated_types.SupportsLt | None = _Unset,
    le: annotated_types.SupportsLe | None = _Unset,
    multiple_of: float | None = _Unset,
    allow_inf_nan: bool | None = _Unset,
    max_digits: int | None = _Unset,
    decimal_places: int | None = _Unset,
    min_length: int | None = _Unset,
    max_length: int | None = _Unset,
    union_mode: Literal[&class="cm">#x27;smartclass="st">', 'left_to_right'] = _Unset,
    fail_fast: bool | None = _Unset,
    **extra: Unpack[_EmptyKwargs],
) -> Any: ...
@overload  class="cm"># `default` argument set, validate_default=True (no type checking on the default value)
def Field(
    default: Any,