def _create_zip(*iterables, fillvalue=None, type_longest=False):
    """Zips supplied iterables and returns a generator.

    Aggregates `*iterables` using `zip` or `itertools.zip_longest`,
    depending on the value of the `type_longest` parameter.

    Parameters
    ----------
    *iterables : iterable
        Iterable objects passed as positional arguments. Passed on to
        `zip` or `zip_longest` depending on the `type_longest` flag.
    fillvalue : optional
        Set all missing values to this default value. Only specified
        when called by `namedzip_longest`. (default is None).
    type_longest : bool, optional
        Specifies whether to use `zip_longest` over `zip`. Used by
        `namedzip_longest`. (default is False).

    Returns
    ------
    generator object

    """
    if type_longest:
        from itertools import zip_longest
        zipped = zip_longest(*iterables, fillvalue=fillvalue)
    else:
        zipped = zip(*iterables)
    return zipped
