OK, now I see, the circular deps occur because you need to import `format.one` and `format.two`, which import `format.format` by themselves, so you can't import those in `format.format`

I still don't like this though, so I'm going to solve this differently, i.e. import `format.*` in the `__init__.py` of `format`, and move `get_format_version_classes` where it belongs imho, which will work too, and allow us to drop `locate.py`.