I discovered something really neat today.
We've got a system with a bunch of rules. Each rule is a method which
returns True or False. At some point, we need to know if all the rules
are True. Complicating things, not all the rules are implemented.
Those that are not implemented raise NotImplementedError.
We used to have some ugly logic which kept track of which rules were
active and only evaluated those.
So, here's the neat thing. It turns out that bool(NotImplemented)
returns True. By changing the unimplemented rules from raising
NotImplementedError to returning NotImplemented, the whole thing becomes:
return all(r() for r in rules)
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