> What, it wasn't obvious in the twisted maze of Python documentation? :)
>
> http://www.python.org/doc/2.4.4/ref/customization.html
*gag* Yes, this is pretty convoluted. I think I finally managed to
figure some of the object protocol out, though.
The dbm module implements PyMappingMethods and that defines mp_length,
essentially __len__(). However, this object would need to also
implement PyNumberMethods, which contains an:
inquiry nb_nonzero;
structure member. (Implementing __nonzero__) Since it doesn't implement
the number protocol, it's always going to fallback to using __len__, as
you observed.
These are the prototypes for inquiry and PyMappingMethods. All of this
is in /usr/include/python2.4/object.h
typedef int (*inquiry)(PyObject *);
typedef struct {
inquiry mp_length;
binaryfunc mp_subscript;
objobjargproc mp_ass_subscript;
} PyMappingMethods;
Hopefully some of this makes sense. :P
-j
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