types.py module has different helpers to get their types, like async def _c(): pass to get coroutine type or def _g(): yield 1 to get generator type, etc.

It has has these line to get CellType:

Afterward, all helpers are deleted, except _cell_factory, which I think should be fixed. It is not good to expose such implementation details.

And this line agrees with me:

Related:

• bpo-36091: remove reference to async generator in Lib/types.py #11996
• bpo-35911: add cell constructor #11771