[Python-Dev] __slots__ and default values

[Guido van Rossum]

> I would prefer to think of this is a useful feature rather than a
> wart. Finally we can have true constants!

Yuck.  If you want that, define a property-like class that doesn't
allow setting.

These "constants" of yours are easily subverted by defining a subclass
which adds an instance __dict__ (any subclass that doesn't define
__slots__ of its own does this).

--Guido van Rossum (home page: http://www.python.org/~guido/)