[Arne Mueller]
> ...
> The problem is that and, or, not sounds more natural for my problem
> than +, - .
Overload
& def__and__(self, other): ...
| def __or__(self, other): ...
~ def __invert__(self): ...
^ def __xor__(self, other): ...
"and" and "or" are control structures in Python, not operators. That's why
you can't overload them.
they-generate-branches-ly y'rs - tim