trouble with the C API

Bernhard Herzog herzog at online.de
Mon Aug 21 13:48:07 EDT 2000

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Stefan Seefeld <seefelds at magellan.umontreal.ca> writes:

> I'm writing a C module for a python tool I'm working
> on and I'm having trouble with the C API. What is the
> distinction between the PyDict_xxx abd the PyMapping_xxx
> functions ? I defined (in python) my own type containing
> the methods __setitem__, haskey, etc. to make it 'dictionary
> conformant'. Now I want to access and modify the content.
> The key is a list of strings (which I map to a tuple on the
> fly). There is no PyMapping_GetItem call for keys other than
> strings. (but the equivalent dict function exists !).

You could use PyObject_GetItem.

> Unfortunately, it appears I can't mix Dict and Mapping functions
> since they operate on different slices of the object. At least
> I can't access an item via a dict call which I set via a mapping 
> call etc....

The PyDict functions only work with dictionary objects. The PyMapping
funtions are more general and work with all objects that support the
mapping protocol at the C-level.

-- 
Bernhard Herzog   | Sketch, a drawing program for Unix
herzog at online.de  | http://sketch.sourceforge.net/

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