def get_default(self, *, call_default_factory: bool = False, validated_data: dict[str, Any] | None = None) -> Any:
        """Get the default value.

        We expose an option for whether to call the default_factory (if present), as calling it may
        result in side effects that we want to avoid. However, there are times when it really should
        be called (namely, when instantiating a model via `model_construct`).

        Args:
            call_default_factory: Whether to call the default factory or not.
            validated_data: The already validated data to be passed to the default factory.

        Returns:
            The default value, calling the default factory if requested or `None` if not set.
        """
        if self.default_factory is None:
            return _utils.smart_deepcopy(self.default)
        elif call_default_factory:
            if self.default_factory_takes_validated_data:
                fac = cast('Callable[[dict[str, Any]], Any]', self.default_factory)
                if validated_data is None:
                    raise ValueError(
                        "The default factory requires the 'validated_data' argument, which was not provided when calling 'get_default'."
                    )
                return fac(validated_data)
            else:
                fac = cast('Callable[[], Any]', self.default_factory)
                return fac()
        else:
            return None
Get the default value.

        We expose an option for whether to call the default_factory (if present), as calling it may
        result in side effects that we want to avoid. However, there are times when it really should
        be called (namely, when instantiating a model via `model_construct`).

        Args:
            call_default_factory: Whether to call the default factory or not.
            validated_data: The already validated data to be passed to the default factory.

        Returns:
            The default value, calling the default factory if requested or `None` if not set.
        
pydantic/fields.py