def _get_default_dict_class_name() ->str:
    """
    Name of the class of the next data descriptor created and returned by the
    next call to the :func:`DefaultDict` function, guaranteed to be unique
    across all such classes.

    Since the human-readability of this name is neither required nor desired,
    this is a non-human-readable name efficiently constructed from a private
    prefix and a unique arbitrary identifier.
    """
    global _DEFAULT_DICT_ID
    _DEFAULT_DICT_ID += 1
    return '__DefaultDict' + str(_DEFAULT_DICT_ID)
