Python actually comes static shapes for objects with __slots__

class vertex(object):

   __slots__ = ["x", "y", "z"]

I use __slots__ in most code after the first refactor for a very important reason - I'm a hyper-caffeinated code monkey.

I wasted an entire day because I set self.peices in one place and self.pieces in another & couldn't figure out the bug, until I used the "grep method".