How to use the injectable.InjectionContainer.NAMESPACES function in injectable

"""
    Utility function to clear all injectables registered for the dependency in a given
    namespace. Returns a set containing all cleared injectables.

    :param dependency: class or qualifier of the dependency.
    :param namespace: (optional) namespace in which the injectable will be registered.
            Defaults to :const:`injectable.constants.DEFAULT_NAMESPACE`.

    Usage::

      >>> from injectable.testing import clear_injectables
      >>> clear_injectables("foo")

    .. versionadded:: 3.3.0
    """
    namespace = InjectionContainer.NAMESPACES[namespace or DEFAULT_NAMESPACE]
    if isinstance(dependency, str):
        injectables = namespace.qualifier_registry[dependency]
        namespace.qualifier_registry[dependency] = set()
    else:
        dependency_name = get_dependency_name(dependency)
        injectables = namespace.class_registry[dependency_name]
        namespace.class_registry[dependency_name] = set()
    return injectables

>>> from injectable import Injectable
      >>> from injectable.testing import register_injectables
      >>> injectable = Injectable(constructor=lambda: 42)
      >>> register_injectables({injectable}, qualifier="foo")

    .. versionadded:: 3.3.0
    """
    if not klass and not qualifier:
        raise ValueError(
            "At least one of 'klass' or 'qualifier' parameters must to be defined"
        )
    if propagate and not klass:
        raise ValueError(
            "When 'propagate' is True the parameter 'klass' must be defined"
        )
    namespace = InjectionContainer.NAMESPACES[namespace or DEFAULT_NAMESPACE]
    for injectable in injectables:
        namespace.register_injectable(injectable, klass, qualifier, propagate)