How to use the injectable.container.injection_container.InjectionContainer.NAMESPACES.get function in injectable

def get_namespace_injectables(
    dependency_name: str, registry_type: RegistryType, namespace: str
) -> Set[Injectable]:
    if len(InjectionContainer.NAMESPACES) == 0:
        logging.warning(
            "Injection Container is empty. Make sure 'load_injection_container'"
            " is being called before any injections are made."
        )
    injection_namespace = InjectionContainer.NAMESPACES.get(namespace)
    if not injection_namespace:
        return set()
    registry = (
        injection_namespace.class_registry
        if registry_type is RegistryType.CLASS
        else injection_namespace.qualifier_registry
    )
    injectables = registry.get(dependency_name)
    return injectables