(feature request) Square.index or Square.file / Square.rank

[jamespayor]

It would be nice to be able to manipulate Squares by their rank and file as ints.

My suggestion here would be to add Square.file : int and Square.rank : int fields accessible from python, that give numbers in the [0, 7] range for manipulation.

I also think it would be nice to add Square.from_coordinates or something to make it easier to pick out a square from file/rank coordinates. This could also be rigged up as a __new__/__call__ for Square, so calling Square(file=3, rank=2) would return one of the pre-made square objects.

[zedeckj]

The update I'm pushing includes Square.index(), which returns the index of a Square in the provided SQUARES list. I'm not sure how I'd want to go about implementing something likerank() and file(), since A3.rank() == 2, may be somewhat confusing, but 1 indexing would be just as problematic.