zigzag_product

zigzag_product(*iterables, iterator_lengths=None, return_index=False): 

LLM Docstring

Enumerate a Cartesian product while reversing selected axes to create a serpentine order.

Inputs are materialized, optionally taking only the supplied iterator_lengths. As the ordinary multi-index advances, axis-direction flags are toggled when trailing indices reset to zero.

• iterables: collections.abc.Iterable

  Input iterables forming the Cartesian product.

• iterator_lengths: collections.abc.Iterable[int | None] | None

  Optional lengths used both to limit materialization and reflect indices.

• return_index: bool

  Whether to yield each value tuple together with its selected index tuple.

• :returns: collections.abc.Iterator

  Iterator over value tuples or (values, indices) pairs.