[Python-3000] why interfaces shouldn't be trusted

[Marcin 'Qrczak' Kowalczyk]

"tomer filiba" <tomerfiliba at gmail.com> writes:

> one thing that worries me with generic methods is, they would
> dispatch based on types... which means my proxies would all break.
> please, think of the proxies! ;)

OTOH proxies generated by my Python<->Kogut bridge would break if
hasattr was used to determine interfaces. For example if obj is a
Kogut object wrapped in a Python object, then obj.__iter__ always
succeeds, but calling the resulting function fails if the underlying
object doesn't actually support iteration.

(Types aren't currently reflected either, so type-based interface
discovery would fail too, but I plan to change that.)

-- 
   __("<         Marcin Kowalczyk
   \__/       qrczak at knm.org.pl
    ^^     http://qrnik.knm.org.pl/~qrczak/