@assure_container
    def set_object_metadata(self, container, obj, metadata, clear=False,
            extra_info=None, prefix=None):
        return container.set_object_metadata(obj, metadata, clear=clear,
                prefix=prefix)
Accepts a dictionary of metadata key/value pairs and updates the
dataset/ETHPy150Open rackspace/pyrax/pyrax/object_storage.py/ContainerManager.set_object_metadata