Instantiating classes which are derived from built-in types.
Achim Dahlhoff
Achim.Dahlhoff at t-online.de
Tue Nov 29 03:01:52 EST 2005
Hi.
I'm trying to find out the diffrence between normal classes and classes
derived from built-in types.
(Which is causing me trouble trying to instantiate a class using C API
calls)
>>> class A:
... pass
...
>>> class B(dict):
... pass
...
>>> type(A)
<type 'classobj'>
>>> type(B)
<type 'type'>
>>>
When I have a handle to A as a PyObject, I can create an instance using
PyInstance_New(). When I have a handle to B, this does not work as the
function wants a class PyObject.
I found that the API function PyType_GenericNew() can create something from
the B type, but it does not call any constructors.
(using the 'dict' here is an example. In my case, I'm using a self-defined
type I'm using as an API into the C++ part of the software.)
Anyone know how an object could be instantiated using a handle to B?
thanks,
Achim Dahlhoff.
More information about the Python-list
mailing list