C API - Creating Python Classes

[Andrew Csillag]

Mark Pope wrote:
> 
> Hi,
> 
> Using the python C API I can, for example, create an Integer Python object
> with the call:
> 
>         PyObject *pMyInt = PyInt_FromLong( 123 );
> 
> I have a python class which I need to create an instance of. How is this
> done?
> 
> I assume I need something like:
> 
>         PyObject *pModule = PyImport_ImportModule( "MyClassScript" );
> 
>         PyObject *pInstance = NEW_INSTANCE( pModule, args );
> 
Close, but not quite...

PyObject *pModule  = PyImport_ImportModule( "MyClassScript" );
PyObject *classObj = PyObject_GetAttrString( pModule, "MyClassName" );
PyObject *args     = Py_BuildValue("(<argument tuple)", arg1, arg2, arg3
...);
PyObject *instance = PyObject_CallObject( classObj, args );

Obviously, you'd need to make <argument tuple> correspond to the
arguments to the MyClassName constructor.  Not to mention the
appropriate Py_DECREF calls when you're done.

Cheers,
Drew

-- 
print(lambda(q,p):'pmt:$%0.2f'%(q*p/(p-1)))((lambda(a,r,n),t:(a*r/
t,pow(1+r/t,n*12)))(map(input,('amt:','%rate:','years:')),1200.0))