C API []-style access to instance objects

[williams.jasonscott]

Hi,

I am having trouble figuring out how to set up an object to be
scriptable through the C API. An example of what I am attempting to
do:

obj = foo.Foo()
obj["key"]

Traceback (most recent call last):

I've tried defining __getitem__ as a method, but that hasn't worked.
Is there a tp_field that I am failing to understand, something like
tp_iter and tp_iternext?

thanks~

 

[Guest]

Hi,

I am having trouble figuring out how to set up an object to be
scriptable through the C API. An example of what I am attempting to
do:

obj = foo.Foo()
obj["key"]

Traceback (most recent call last):

I've tried defining __getitem__ as a method, but that hasn't worked.
Is there a tp_field that I am failing to understand, something like
tp_iter and tp_iternext?

tp_as_mapping is what you're looking for. It takes the pointer to another
structure: PyMappingMethods.

You might want to try the modulator script (comes with the source
distribution of python), which generates some of the basic type methods for
you. It's a bit old, but gives a good start.

nd

 

[williams.jasonscott]

That worked! Thank You!

I'd also like to say this group is great at fast accurate responses!
Cheers!

thanks....
~jason