[Python-3000] my take on "typeclasses"

[Marcin 'Qrczak' Kowalczyk]

Talin <talin at acm.org> writes:

> sequence( indexable ):
>     -- an indexable in which the indexes are successive integers
>     -- Test: isinstance( index_type, int )

I don't understand. How would this test distinguish [] being a
sequence from {} not being a sequence?

> mapping( indexable ):
>     -- an indexable in which the indices are hashable values:
>     -- Test: hashable( index_type )
>     -- (Also test for immutable if its feasible)

And this on the contrary?

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