Christopher T King
squirrel at WPI.EDU
Thu Jul 1 15:03:02 CEST 2004
George Sakkis wrote:
> I wonder if people have come up with such pitfalls in practice or I was just
> careless. In any case, I was tempted enough to write a simple extensible
> runtime type checking module, which can be handy, at least during
> development. It's extensible in the sense that a "type" can be any
And in other places: some functions need to behave differently depending
on the types of their arguments. When interfaces come into play,
isinstance() just doesn't cut it.
> ContainerOf, TupleOf, ListOf and DictOf are all extensions of the abstract
> TypeChecker class, providing some limited but common templated-type
> checking. Of course in practice most complex structures (e.g. phonebook)
> would be encapsulated in a class, so it's questionable whether such
> functionality adds up anything to a list of "assert isinstance(object,type)"
> statements. Any ideas or suggestions are welcome.
Along with TupleOf, ListOf, DictOf, etc., include interface checkers,
such as SequenceOf and MappingOf. People will love you for it.
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