throw new IllegalStateException("The transformer in MappingProvider must always return a value");
        }
        return transformedValue;
    }

    @Override
    protected void beforeRead(EvaluationContext.ScopeContext context) {}

    @Override
    protected String toStringNoReentrance() {
        return "map(" + (type == null ? "" : type.getName() + " ") + provider + " " + transformer + ")";
    }

// which implements the Verifier interface. The caching characteristics of the
// OpenAPI V3 specs are determined by the passed oapiClient. For memory caching, the
// client should be wrapped beforehand as: cached.NewClient(oapiClient). The disk
// caching is determined by the discovery client the oapiClient is created from.

    @Override
    protected void processClassFile(ClasspathBuilder.EntryBuilder builder, ClasspathEntryVisitor.Entry classEntry) throws IOException {
        // We can filter out "unsupported" classes without checking the manifest beforehand.
        // Even if this JAR isn't multi-release per manifest, classes in META-INF/ cannot be loaded, so they are just weird resources.

		fmt.Println("[preflight] This might take a minute or two, depending on the speed of your internet connection")
		fmt.Println("[preflight] You can also perform this action beforehand using 'kubeadm config images pull'")
		if err := preflight.RunPullImagesCheck(utilsexec.New(), initCfg, j.IgnorePreflightErrors()); err != nil {
			return err
		}
	}
	return nil
}

// Note: NewMethodSet is intended for external use only as it
//       requires interfaces to be complete. It may be used
//       internally if LookupFieldOrMethod completed the same
//       interfaces beforehand.

// NewMethodSet returns the method set for the given type T.
// It always returns a non-nil method set, even if it is empty.
func NewMethodSet(T Type) *MethodSet {

## Bodies of arbitrary `dict`s

You can also declare a body as a `dict` with keys of some type and values of some other type.

This way, you don't have to know beforehand what the valid field/attribute names are (as would be the case with Pydantic models).

This would be useful if you want to receive keys that you don't already know.

---

This is useful if you don't know the valid field/attribute names (that would be needed for a Pydantic model) beforehand.

In this case, you can use `typing.Dict` (or just `dict` in Python 3.9 and above):

=== "Python 3.9+"

    ```Python hl_lines="6"
    {!> ../../../docs_src/extra_models/tutorial005_py39.py!}
    ```