C API []-style access to instance objects

[williams.jasonscott@gmail.com]

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:
[color=blue][color=green][color=darkred]
>>> obj = foo.Foo()
>>> obj["key"][/color][/color][/color]
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: unsubscriptable object[color=blue][color=green][color=darkred]
>>>[/color][/color][/color]

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~

[André Malo]

Re: C API []-style access to instance objects

* williams.jasons cott@gmail.com wrote:
[color=blue]
> 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:
>[color=green][color=darkred]
>>>> obj = foo.Foo()
>>>> obj["key"][/color][/color]
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> TypeError: unsubscriptable object[color=green][color=darkred]
>>>>[/color][/color]
>
> 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?[/color]

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

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
--
"Umfassende s Werk (auch fuer Umsteiger vom Apache 1.3)"
-- aus einer Rezension

<http://pub.perlig.de/books.html#apac he2>

[williams.jasonscott@gmail.com]

Re: C API []-style access to instance objects

That worked! Thank You!

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

thanks....
~jason